Terry Matalas, who worked with Stashwick (pictured) on Star Trek: Picard, is the showrunner on the untitled series that will go into production in 2025.
Bettany, who has appeared in three Marvel films and Marvel's WandaVision, will reprise his role as the character Vision in the series. Spader reprises his MCU role of Ultron.
Details about the new series have not yet been revealed, but as we previously reported, the Marvel Vision series has been in development at Disney+ since 2022.
The series revolves around The Vision (Bettany) who tries to regain his memory and humanity. After being killed by Thanos in Avengers: Infinity War, Vision returned in Marvel's 2021 WandaVision.
Stashwick appeared as Captain Liam Shaw in Paramount+'s Star Trek: Picard. His series roles also include SyFy's 12 Monkeys, The CW's The Originals and S.W.A.T. (2017) from CBS.