Recently, we learned that Holt McCallany will be Atlas in Percy Jackson and the Olympians Season 3 for six episodes. Deadline was the first to report this on Monday, this week. The series was already renewed for a third season early this year, but the status of the fourth and fifth seasons is currently unknown.Amid the production of Percy Jackson and the Olympians Season 3, Rick Riordan discussed the upcoming season in a ScreenRant interview. Riordan, in particular, discussed the main villain of the upcoming season. The author revealed that Atlas's presence in season 3 will make Kronos's threat even more real.ScreenRant pointed out that Atlas would be the first Titan to physically appear in the Disney+ series apart from Kronos, who has been appearing in Percy's dreams. To this, Riordan responded:"Yes. The threat in season 3 becomes real. I mean, real in your face, physical manifestation, real. And although we can't talk casting, they nailed it. I mean, they basically said, "We're thinking this." I'm like, "Yep, that's it." So I can't wait to share it."What do Rick Riordan's comments mean for Percy Jackson and the Olympians Season 3? View this post on Instagram Instagram PostAs mentioned before, Atlas's role in Percy Jackson and the Olympians Season 3 is exciting because he is the first Titan in the Disney+ series to appear in flesh. While we have seen the hooded silhouette of Kronos in the two seasons, we have not seen what he looks like. As the Disney+ series is staying faithful to the books, we won't see him until the fourth season, if it happens.Until then, we have Holt McCallany's Atlas, the immortal being who is responsible for holding the sky on his back. Deadline also revealed two more additions to Percy Jackson and the Olympians Season 3's cast. Breaking Bad and Billions' David Costabile is playing the manticore Dr. Thorn, and The Flash's Jesse L. Martin as Annabeth’s human father, Frederick Chase.Percy Jackson and the Olympians Season 3 is currently filming, and it is expected to continue for the coming months. Until then, fans can enjoy Percy Jackson and the Olympians Season 2. The third season will be adapting The Titans Curse, which was published in 2007. The synopsis for the book reads:"When Percy Jackson gets an urgent distress call from his friend Grover, he immediately prepares for battle. He knows he will need his powerful demigod allies at his side, his trusty bronze sword Riptide, and… a ride from his mom. The demigods rush to the rescue to find that Grover has made an important discovery: two powerful half-bloods whose parentage is unknown. But that’s not all that awaits them. The titan lord Kronos has devised his most treacherous plot yet, and the young heroes have just fallen prey. They’re not the only ones in danger. An ancient monster has arisen — one rumored to be so powerful it could destroy Olympus — and Artemis, the only goddess who might know how to track it, is missing. Now Percy and his friends, along with the Hunters of Artemis, have only a week to find the kidnapped goddess and solve the mystery of the monster she was hunting. Along the way, they must face their most dangerous challenge yet: the chilling prophecy of the titan’s curse."Three episodes of Percy Jackson and the Olympians Season 2 are currently available, with the fourth one, "Clarisse Blows Up Everything", streaming tomorrow.