Apple TV's popular sci-fi series, which has now released its season two finale, is headed to a third and fourth season to conclude the drama.

Ashley Zukerman ( Succession, Fear Street trilogy) and Jessica Henwick ( Huntington, The Royal Hotel) have joined the series regular cast of the Apple TV+ series Silo for Season 3. Zukerman will star as ‘Daniel,’ a young and hungry congressman, and Henwick as ‘Helen,’ a whip-smart reporter.

The season two finale of Apple TV+'s 'Silo' will air on January 17, featuring a major surprise. The show has been renewed for two more seasons, adapting Hugh Howey's novels 'Shift' and 'Dust'. Although season three diverges from the book,

Silo” Season 3 is already building out its cast. Variety has learned that both Jessica Henwick and Ashley Zukerman are set to appear as series regulars in the upcoming third season of the Apple TV+ post-apocalyptic drama based on Hugh Howey’s “Wool” novel trilogy.

Warning: Major spoilers for the Silo Season 2 finale ahead. Silo, based on the books by Hugh Howey and created for television by Graham Yost, has become one of the crown jewels of Apple TV+, recently earning a two-season renewal for Seasons 3 and 4 (the latter of which is set to be the show’s final installment).

After the dramatic Season 2 finale aired, fans are wondering about the future of Apple TV+'s Silo. The series is based on Hugh Howey's New York Times bestselling trilogy of dystopian novels, Wool (2011),

Silo seasons 3 and 4 are indeed happening at Apple TV+. Following the critically acclaimed debut of season 2, the streaming service announced that the hit sci-fi drama is officially renewed through season 4,

The Silo Season 2 finale gives us a lot of answers, but still manages to end in a major cliffhanger. Here's what the ending means for Rebecca Ferguson's Juliette and the other silo occupants.