The first three episodes of Stranger Things Season 5 Volume 2 were released earlier today, and fans have been loving the season so far. Season 5 marks Kali’s return to the series, while Volume 2 unveils several crucial details, including key insights into why Dr. Kay was focused on Martin Brenner’s former test subjects.Check out the official trailer for Volume 2 here:In this season, we see how Kali was kept as a prisoner in the Upside Down military base. However, one of the primary questions that people have in their minds is why Kali was kept as a prisoner.The real reason for this is revealed in Stranger Things Season 5 Vol 2.Why was Kali held as a prisoner in the Upside Down military base? Real reason revealed in Stranger Things Season 5 Vol 2In Stranger Things Season 5 Volume 2, after escaping the military base, Kali explains to Eleven and Hopper how and why she was held captive in the Upside Down. She reveals that Dr. Kay and her team shaved her head, restrained her, and continuously extracted her blood. She also discloses that her friends were killed before she was taken to the Upside Down. View this post on Instagram Instagram PostKali revealed her escape plan, stating that she pretended that her body was failing to get the doctors to remove her restraints. Once that worked, she attacked the military personnel, including army officers and doctors. However, while she was looking for an exit, she ended up finding out what Dr. Kay was really planning on doing with her blood, and before she could decide what to do with this information, she was recaptured and held captive behind a vaulted door.However, Eleven and Hopper find her before something else happens.READ MORE: Does anyone die in Stranger Things Season 5 Volume 2? Details revealedWhile it is unclear how long Kali was held captive by Dr. Kay's team, this information explains why Kali was initially so happy and relieved to see Eleven and Hopper, despite their past relationships.It seems like an advantage to have Kali on their side to fight Vecna, since she is another superpowered figure. However, it is also worth keeping in mind that there can be some concerns about Eleven's future, given Dr. Kay's intentions with her, as revealed by Kali.Almost all episodes of Stranger Things Season 5 Vol 2 are available to stream on Netflix right now, with the finale episode scheduled to be released on New Year's Eve.READ MORE: What is "the Abyss" in Stranger Things Season 5 Volume II? Exploring the Netflix sci-fi show's latest alternate dimension