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.

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.

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.

"Silo" is growing its Season 3 cast with the additions of Ashley Zukerman and and Jessica Henwick. Zukerman ("Succession," "Fear Street" trilogy) and Henwick ("Huntington," "The Royal Hotel," "Glass Onion") will join the Rebecca Ferguson-led show as series regulars beginning next season,

Curious about the Silo Season 2 finale? Jessica Henwick's flashback scene as Helen leaves fans pondering its connection to the larger narrative. The finale, titled Into the Fire, introduces Donald Keene,