In 2006, Nick Newman and Phyllis Summers became attracted to each other, and began a steamy affair. Nick's wife Sharon found out, she and Nick separated. Phyllis turned up miraculously pregnant after doctors told that she could never conceive again. She admitted to Nick that the baby could also be Jack's, so Nick took a paternity test. Although no one ever saw the results but Nick, he informed Phyllis that he was the father, but that he intended to stay with Sharon and their son Noah. Phyllis was disappointed, but insisted she could raise their child alone. Jack was disappointed too since he'd always hoped for a reconciliation with Phyllis and a child of his own to raise from birth.
But after Nick told Sharon about the pregnancy, they were divorced. Nick and Phyllis eloped in New Mexico, and returned to Genoa City married and looking forward to the birth of their daughter. On her way to the hospital for a caesarean because her baby was in the breech position, Phyllis and Jack became trapped in the Newman elevator, and Phyllis went into labor. Fearful that the baby would not deliver normally and die, Phyllis implored Jack to cut the baby out of her using a nail scissors. But Jack ended up turning and delivering the baby, who was later named Summer Ann. Jack developed a close bond with Summer, and set up a nursery for her at Newman Enterprises, where Jack and Phyllis both worked.
By 2010, the tables were turned, and Nick left Phyllis when he got Sharon pregnant. Patty Williams attempted to frame Phyllis by making Summer have an allergic reaction and go into a coma by kissing her with peanut butter on her lips. After seeing Nick so distraught over his daughter Summer being in a coma, Sharon realized that Nick needed to be there for Summer and Phyllis. Summer came out of the coma, but with brain damage affecting her speech. Summer’s obsession with watching the video of their wedding made Nick realize how much he really loved Phyllis and wanted them to stay together, even marry her all over again. After their remarriage, Phyllis took Summer to Switzerland for expert help with her recovery from her disability. After she returned to Genoa City, Phyllis quit her job to stay home and spend more time with Summer.
In 2012, Summer showed up at Nick and Phyllis' remarriage aged to a teenager. Not long afterward, she was sent to camp to be a counselor to not have to deal with Daniel's arrest for suspicion of murder. Summer returned home to find her mother, Phyllis, arrested for attempted murder of a federal officer (Christine Blair from back in 1994). Nick tried to send her to New York to live with Noah, but Summer refused and convinced Nick to stand by Phyllis with her.
Summer reacted to hearing that her mother was having an affair with Detective Ronan Malloy by spiking her drink with alcohol, but Ronan caught her, and took her home to her parents. Nick decided to move out and move back to the former tack house at the ranch, and Summer left with him. Later, Abby convinced her to give her mother another chance, but when she entered Phyllis' penthouse, she discovered Phyllis and Ronan getting hot and heavy on the couch, so she left unnoticed. Summer then vandalized Ronan's car, saying that she hated them both. Nick told Ronan he would be after him next if he pressed charges, to let Nick handle Summer. Summer disappeared with Fen, and they hid out in the skating rink, spent the night there, and kissed the next morning. After they were found, and another altercation with Phyllis, Summer took off in her car. Driving recklessly and in tears, she collided with Adam and Chelsea, then ran into a tree, totaling her car. Summer was devastated when Chelsea let her know that the accident had caused Chelsea to miscarry. Phyllis was freed on after her case was dismissed on a technicality, and Nick filed for divorce. Still mad at her parents, Summer went to Avery to get her help to file for emancipation.
After observing Ronan with a teenage boy at Crimson Lights, Summer stole the kid's wallet and quizzed him discovering that he was Jamie Vernon, a juvenile delinquent who was being mentored by Ronan. Using a fake FacePlace profile as "Brittni", Summer friended Jamie and got him to admit he had been arrested for breaking into his dad's girlfriend's house and trashed the place because she ruined his family. When Fen discovered Summer posting it online to get back at Ronan, Fen accused her of bullying and begged her to stop. After confiding in Ronan, Jamie unfriended "Brittni," and Ronan told Phyllis he suspected it was Summer. Phyllis tried to get close to Summer again, but failed, so she enlisted her sister Avery's help. Avery made cupcakes with Summer, and she seemed to bond with her, helping Summer to realize that emancipation was not a good idea. Summer encouraged Avery to get serious with her father Nick.
Noah found out about her bullying Jamie, and cautioned Summer about her irresponsible actions. Summer went to Jamie and assured him that she was not "Brittni" or like the rest of the kids who picked on him. Fen accused her of faking it, but she claimed she actually liked him. Summer came on to Fen again to try to get him not to rat her out to their parents, and Fen reacted by pulling away and telling her he didn’t really like her very much. But Fen jealously took over taunting Jamie due to Summer and his father Michael's sudden interest in the boy. Phyllis found out that Summer had been skipping school, and they came to an understanding after Phyllis related how she had left home when she was too young, and that she didn't want Summer to have the life she had by heading down the same path. For her birthday, Summer received a new car from Nick and an infinity charm necklace from Phyllis, and everything appeared to be forgiven.
Jamie's father was arrested for a hit and run DUI, and causing an injury. Once his father went to jail, Jamie would have no one to live with, and would be headed for foster care. Hearing about this, Fen became jealous, sure that his parents would take the kid in. Later, while talking with Summer, Jamie kissed her. Jamie was put in a group home, and Michael discovered Jamie had been beaten up by his roommates, but was unable to persuade a judge to intercede. Fen saw Summer hugging Jamie again over his injuries and went off on them, telling Jamie that Summer was his FacePlace stalker Brittni, causing Jamie to pack his things and disappear. Michael confided in Paul how concerned he was that Fen was heading toward becoming another Ricky or young Michael or Kevin, being so full of rage. Paul tried to reason with Fen and convince him that Michael loved and wanted to help him.
Jamie was found unconscious after falling from a roof and Fen's camera was found at the scene. Jamie regained consciousness and was released, but he refused to tell anyone what had happened. Jamie told Summer that she and Fen were both responsible for everything that had happened to him. Summer apologized, explaining that by bullying him as Britni she had only been trying to get back at Ronan, but now realized it was pretty dumb. Then after a verbal fight between Fen and Jamie, Jamie decided to press charges against Fen, and Fen was arrested for assault. After Fen was bailed out by Lauren, he decided to run away. Summer picked him up hitchhiking, and talked him into going home.
After Paul found Jamie attempting to jump from the same roof, he convinced Jamie that he could help him make things better. Jamie admitted that he had lied and had been attempting suicide that night on the roof with Fen, and the changes were dropped against Fen. Jamie told Paul about being bullied by Summer and Fen, so Paul visited Phyllis and let her in on what had been going on. Phyllis and Summer had a heart to heart, and they seemed to be on the road to understanding that they were so much alike. Much to Fen's relief, Ronan was granted guardianship of Jamie and he moved to Washington, D.C. to live with Ronan after apologizing to the Baldwins for all the trouble he had caused them. Summer happened upon Jamie and Paul on their way to the airport and apologized to Jamie and wished him well.
Abby warned Kyle that Summer had crush on him, but he wouldn't believe it. Meanwhile Summer wrangled a job as an intern at Jabot working with Jack to be close to Kyle, and pumped Jack for information on Kyle. Unable to get Kyle to pay attention to her, Summer arranged for him to walk in on her without her blouse, claiming that she had spilled coffee on it. Kyle was mortified and tried to turn away, finally giving her his jacket to cover herself – just as Phyllis walked in on them. Phyllis saw through Summer's ruse and sent Kyle away. Phyllis told Summer that she wanted her first time to be special, that Kyle had no feelings for Summer, and she would only get hurt. Phyllis asked Summer, "How many times have you said you did not want to be like me?" and told her to back off. Afterward Phyllis told Nick about Summer's bullying of Jamie, and that she was going to be doing community service for it that summer.
Kyle walked out of his shower to find Summer naked in his bed. He asked her to get dressed, and told her he thought of her as family, as the little girl with her dolls. When Summer was not dissuaded, Kyle told her he was involved with someone else, and that she was too young. So Summer's friend Courtney Sloane gave her a makeover to show him she was no longer a kid. Kyle did a double-take when he saw Summer, but still told her no.
Phyllis returned from a romantic trip to Istanbul with Jack, ready to move in with him. Summer approved, hoping it would mean that she could live where Kyle lived, at Abbott Manor. Claiming to want to be close to Phyllis and put off by Avery's presence in Nick's life, Phyllis asked Jack if Summer could move in too, and he reluctantly agreed.
Lily came up with a Jabot Face of Fashion marketing campaign called "Dare to be Different" for Chelsea's designs using unknown models, and it was approved with Lily working with Tyler. Tyler suggested Summer as their model. Chelsea forgave Summer for the death of her unborn child, saying that they were both getting a second chance. Tyler offered Mason Wilder a modeling job. All were impressed with the test shoot with Mason and Summer. Summer celebrated by going to The Underground with her friend Courtney using a fake ID. She was caught by Tyler, who cautioned her that she would be jeopardizing her new job. Then both Noah and Nick arrived, and they were busted.
After Nick overheard Summer confiding in Avery about wanting Kyle to be her first sexual experience, he went ballistic on Kyle. As Summer told her mother how Nick over-reacts to the very idea of her and Kyle, Nick pulled Summer's paternity results from a locked box. After all those years, it turned out that the test results had been inconclusive due to a contaminated sample, so Nick took another test.
Summer accepted a prom date from Fen, but ditched the prom, dragging Fen to a party she had set up at her mother's penthouse instead. Everyone was drinking, and they played truth or dare. As a tipsy Fen completed his dare to kiss Summer, Kyle burst in to rescue Summer after receiving a text. Phyllis, who had just moved out of Jack's, arrived at the penthouse to find Kyle punching Fen in the mouth. She sent the other kids home and called Nick, Michael, and Lauren. Calling her irresponsible, Nick took away Summer's car, asking her if she had forgotten that her sister Cassie's drunk-driving death anniversary was only the next day. Kyle asked Summer to dinner, and they kissed good night when he took her home afterward.
When they realized that Summer was experiencing some of the same things that had led to Cassie's death, Nick, Sharon, and Phyllis had a heart to heart with Summer. They explained to her, with the help of an email from Daniel, how alcohol and obsession with an older boy had not only led to Cassie's death and broke up her parents marriage, but haunted Daniel to this day, and affected Lily as well when she was sent away to boarding school. Summer seemed to learn from it, and only days later she was requesting birth control pills from a doctor. Summer planned her first sexual encounter with Kyle for her high school graduation night. Following Summer's graduation, she and Kyle went to dinner at the athletic club, and Summer suggested they get a room. Kyle talked her out of it, saying they were rushing things. Phyllis left to attend a focus group on eyeliner in Chicago, taking Kyle with her to keep them apart. Phyllis came on to Kyle, and after one kiss, Kyle called things off with Summer. The next day, Summer said goodbye to Faith, texted Kyle, and ran away to Chicago. When Kyle realized how much he had hurt Summer, he called her and apologized, asking her to return, and they would be together again.
Meanwhile Phyllis was confronted by Jack who had overheard Kyle and Abby discussing the kiss between Kyle and Phyllis. After the others had left, Phyllis explained that she was just trying to break them up, then went on to tell him why by breaking the news that Jack was Summer's father. In Chicago, Nick was telling Summer the same. Jack was moved to tears, remembering how he had delivered Summer and watched her grow up from afar. Phyllis admitted that she had only known for a month, and had been waiting for the right time, afraid it would send him into a relapse. Although Phyllis begged to stay, Jack threw her out. In Chicago, Summer took it hard, then realized it meant that she and Kyle were half brother and sister. As Jack reached for a drink, the spirit of John Abbott kept Jack from relapsing into addiction. In Chicago, Summer refused to go home with Nick, so he left when Phyllis arrived.
Back in Genoa City, Kyle arranged to get Billy's club after hours, invited Summer, and gave her an armload of yellow roses, begging her to start over. Summer had to be the one to tearfully tell Kyle that they were brother and sister. Kyle walked out upset, unable to deal with it.
Nick went to see Jack who punched Nick after Nick said that he was sorry. Jack yelled at Nick that he not only stolen Jack's time with Summer, but he had stolen Summer's past, and he hoped that maybe there was hope for a future between Jack and Summer.
Next Summer went to Jack and they both tearfully exchanged their feelings of how much they had always cared for each other, and hope for a future as father and daughter.
A few days later, Nick and Avery found Phyllis unconscious at the bottom of a stairwell during the MS gala. Later at the hospital, Phyllis was still unconscious when Dr. Costner informed Jack, Nick, and Avery that Phyllis had a blood clot pressing on her brain requiring surgery. The surgery was performed, and was successful. Daniel was notified in Europe and said he was on his way home. Nick finally found Summer hiding out at the penthouse, and had to tell her that her mother needed her at her side to help her fight for her life. Phyllis regained consciousness with Jack at her bedside, but she got so agitated, she had a convulsion, and lost consciousness again. Tests found a contrecoup injury, a bruising on the frontal lobe, and that Phyllis had lapsed into a coma, from which she may never regain consciousness. Daniel arrived too late. While Summer, Avery, and Jack were content to sit by her side and wait months or years for Phyllis to wake up, Daniel did some research and found a facility on an island off the coast of Georgia where the best neurologists were having some success reviving coma patients. All were adamantly against it until Daniel convinced Michael, Lauren, and Summer who convinced Jack and Nick, then Nick convinced Avery to allow Daniel to take her there to give her the best shot at recovery.
Amid all the crisis, Summer was thrilled to see the first print ad for the line, 'Chelsea Lawson by Jabot' which featured Summer and Mason Wilder as the models.
While playing fairy princess with Faith, Summer discovered that Sharon wore the same lipstick that was found by the police in the stairwell after Phyllis' fall, and Nick wondered if maybe someone may have been there with her when she fell.
Summer felt she was hurting Nick as she and Jack began to try to get to know each other better. And Victor pressured her to be a Newman, no matter what the DNA said. Summer felt the need to get away, so Victor offered her a stay at the Newman owned resort in the Bahamas. But she accepted a trip on the Abbott jet to Georgia to be with her mother instead.
Summer returned in time for Nick's wedding, and Kyle talked her into going. But Nick got stood-up at the altar by Avery. Summer went to Nick to console him, and they agreed to meet for dinner. On her way, Summer got a call from Oliver the L.A. photographer inviting her to come to L.A. and meet some people about working there. Arriving at the club, Summer walked in on Victor and Jack with Jack offering to walk away from Newman, if Victor would give up turning Summer against him and let him bond with his daughter. Summer yelled at them both for using her as a bargaining chip, Nick arrived, yelled at them some more, and they left. Afterward, Summer confided in Courtney, Kyle, Avery, and Jack that she was ready to go to L.A. to escape the Abbotts and the Newmans.
Summer visited Fen in prison where he was serving a sentence for drugs, and Fen shocked her with the knowledge that his dealer Raven had told him that Summer's best friend Courtney was her biggest customer. Summer told Noah, and they both realized how little they knew about Courtney, that she never spoke of her family, nor had either of them met them. Summer confronted Courtney, and she denied it. Having never shown any signs of drug use, Summer believed her. But Noah was still skeptical. Later after Summer saw a message on Courtney's phone from someone named Zach, Courtney admitted that he was a family member who was messed up.
Jack and Summer went to see Phyllis on Thanksgiving, but returned disappointed, making it home in time for the Abbott Thanksgiving, and were joined by Ashley, Abby, and Tyler.
Worn out at a photo shoot, Summer took an "energy drug" from fellow model Esmeralda, had a reaction, and called Fen for help. Fen, who was on house arrest with an ankle monitor, came to the shoot but was arrested. Sharon discovered Summer, who had fallen down some stairs. Summer was diagnosed with congestive heart failure, and Esmeralda had to give Dr. Rayburn the drug to help save her. Summer regained consciousness with Nick holding her hand, with no permanent heart damage.
Summer visited Fen in prison to thank him for risking his freedom to save her life. Fen said the only way she could repay him was to stay away from drugs. Afterward, Summer met a man in the park named John Darwin who told her he was a life coach and gave her his card for "The Path", should she ever need any help. Summer confided in Noah and later in Sharon that she seemed to have no direction in life, had quit her modeling job. Summer visited John in his hotel room hoping to find "her path", filled out a form, and let John snap a photo of the two of them together. During Summer's next visit, Nikki showed up telling her that he was a criminal named Ian who preys on young girls, and made Summer leave. Her father, Nick, later explained that Ian Ward was the man who had run the cult and taken advantage of Nikki decades ago. Ian was later arrested for extorting money from Nikki to leave town. Chaperoned by Jack, Summer later visited Ian in Washington D.C. where he was being held awaiting trial, and thanked him for taking advantage of her which caused her to find herself – someone stronger than she realized, who would turn to family not a sick stranger, a family who loves her for who she is. Summer decided to move into Abbott Manor, and Jack sold Phyllis' penthouse, putting the money into a trust.
Summer was shocked when Courtney admitted that she had been an undercover cop who had attended high school with her to arrest the people who were selling drugs to students. Summer forgave her for the lies she had told, and they agreed to return to being best friends again.
Arriving at Crimson Lights, Summer ran into fellow-model Esmerelda being sweet-talked by Ian who had been set free after a mistrial. Summer broke in and told Esmerelda not to listen to the fraud. Ian angrily accused Summer of defaming him.
Summer began to get close to Austin Travers, the cameraman for Avery's cooking show. They eventually kissed and both began confiding in each other. Summer told him she was upset to see Jack getting closer with Kelly, feeling that he was not being loyal to Phyllis. Austin told her that he understood, that he had lost his mother unexpectedly a few years back. He commented that he resented defense attorneys who get guilty clients off. Summer tried to get Austin to make love to her, but he said that he had come to Genoa City to do a job, had a short term lease, and would be leaving soon. Not long afterward, Summer heard that Avery had been held hostage by Austin, police chief Paul Williams had been shot, and Austin was on the run and had been shot leaving the scene. Austin called Summer asking her to meet him, and she did. He wanted to say goodbye, but Summer wanted to go on the run with him, as Austin doubled over in pain from the gunshot wound in his shoulder. Summer texted Jack that she was okay and wished him happy father's day.
Summer and Austin caught a bus heading for Canada and spent the night in a motel with Austin sleeping on the couch. The next morning Summer texted Nick and Jack, "I'm all right. I know what I am doing. Love you both." Summer bandaged Austin's wound while he tried to talk her into going home. But Summer was adamant in going with him into Canada, and convinced him to take her virginity. While Summer took a shower, Austin slipped out, and the police were at her door shortly afterward. As Summer was talking with Nick by phone, Austin was turning himself in, in Genoa City.
Arriving back in Genoa City, Summer claimed that there was something special about Austin, that she knew he was "the one", admitting to Avery that they had made love but had used protection. Summer begged Avery to defend Austin, and Avery explained that she could not because she was the victim, but she agreed to give Austin legal advice until they found him an attorney. Summer turned down both Jack and Nick's offers and went home with Avery. Summer refused to give up on Austin, claiming to be in love with him. When Jack turned Summer down to bail out Austin, she went to Nick, who also said no. Summer called the still-unconscious Phyllis, and told her that she had fallen in love.
Paul's life was saved by a partial liver donation by his son, Dylan McAvoy. Avery's partner Leslie took over his case and got Austin out on bail using money Summer obtained from her trust fund. Summer told Austin she was in love with him, and would never turn her back on him. Austin said that he cared about her, but she needed to face the truth, that he could go to prison for years, and he didn’t want to see her get hurt. Summer came up with a solution in the style of her mother. And when Jack found them together at the Abbott lake house, they shocked him by announcing that they were married. Jack accused Austin of being after her money or keeping Summer from testifying against him. Summer said she was the happiest she had ever been, and accused Jack of only wanting to spoil it. Jack spoke to D.A. Christine to arrange for Summer to be arrested for fraud.
Summer decided they should be officially married in a church and invited Noah and Courtney to stand up for them. Sharon said she felt she owed it to Phyllis and helped Summer get ready, and Faith was the flower girl. Sharon convinced Nick to walk Summer down the aisle, but Jack arrived, and they began again with both Jack and Nick walking her down the aisle, and Summer and Austin were married again. Detective Harding arrived to arrest Austin for fraud, but Jack talked him out of it with everyone swearing the couple loved each other and no fraud was being committed.
Rather than let Summer live with Austin at his unsafe apartment, and knowing Summer's aversion to living in Phyllis', Jack gave them one of his apartments rent-free instead. Austin was determined to find a job, and he happily spotted one for a cameraman. He remarked to Summer that his mother had bought him a camera for his tenth birthday to get him away from video games, and he'd turned it into a career. But Austin's crime lost him that job. Austin wandered into The Underground and filled out an application, but was shocked when Nick walked in and he realized it was Nick's bar. Nick stopped him from leaving, was impressed with his resume, and hired him.
Concerned about his trial being only a week away, Austin began trying to live in the moment in the time they had left together, pre-celebrating holidays like Christmas. Summer just wanted to run away again, but Austin talked her out of it.
With Austin's trial a day away, Summer decided to celebrate Valentines Day, showing Austin how much she loved him, she gave him a day planner already marked with dates she felt confident they would make together. Austin was overwhelmed, telling Summer that she gave him hope, made him happier than ever thought possible, and wishing they had met sooner.
Thanks to Avery's letter to the judge forgiving him, and Paul's refusal to testify at the trial, Austin was given deferred adjudication with a fine and community service. Afterward Austin admitted to Summer that he had only married her to help his case, but assured her that he had fallen in love with her since. Having no money to pay Austin's fine, Victor released some of Summer's trust fund so that she could pay it for him. Nick gave Austin a job at The Underground, and Austin found a second job as a lifeguard at the GCAC rooftop pool.
Summer and Austin celebrated with a dinner party, inviting Kelly and Jack. Jack broke the news that he had said goodbye to Phyllis and that Kelly had moved in with him. Summer tearfully accepted it, but said that she still would never give up on Phyllis.
Summer, Faith, Mariah, and Noah were pleased when Nick and Sharon decided to remarry and asked them to be a part of the wedding. Just before Sharon and Nick were pronounced man and wife, everyone was shocked when Phyllis interrupted the wedding, walked down the aisle, was embraced by Summer, and collapsed. Afraid that she was going to expose her big secret, Sharon ran off, and the wedding was never completed. It turned out that Phyllis had woken up from her coma, stolen a nurse's scrubs, and hitchhiked home from the Georgia hospital. Phyllis woke up in Genoa City Memorial with Summer at her bedside. Austin was crushed when Summer took off her wedding ring and introduced him as her friend after being cautioned not to tell Phyllis anything that may upset her. But Ashley managed to expose the fact that they were married. Phyllis was shocked and demanded an annulment, but Jack talked her into giving Austin a chance. Jack was livid after discovering that Victor had been responsible for Phyllis' recovery, putting her on an experimental drug by tricking Summer into signing consent forms. But Victor gloated that he had managed to do what Jack could not, and everyone should be thanking him.
Tired of being in the dark, Phyllis hacked into Jack's laptop and checked GC Buzz for the goings on over the past year. Phyllis confronted Summer with her discovery that her new son-in-law Austin had held Avery hostage and nearly killed Paul Williams. Summer pointed out that Phyllis had almost killed Paul Williams herself once, so she should understand how people can change. Avery defended Austin to Phyllis as well.
Jack tearfully broke it to Summer, that she was not his daughter after all, and that Sharon had tampered with the paternity test results. Summer would not believe it at first, then they hugged and cried together. Summer said that she could not have made it thru the year without him. Jack said his heart was breaking, that Summer had filled a corner of his heart he did not know was empty, and he would miss her. Summer assured Jack that they would still see each other all the time, and would be okay, that she had Austin. As Summer told Austin about her new parentage, it occurred to her that the lie had kept her and Kyle apart. Later Abby brought it up, and Summer said she had called Kyle and they had discussed it, but that she was married and happy with Austin.