OFFICIAL: Disney+'s X-MEN '97 will feature the return of Mr. Sinister as a villain in the series:
— MCU - The Direct (@MCU_Direct) March 21, 2023
"[He] has a pretty foolproof plan to destroy the X-Men once and for all!" Details: https://t.co/XpSUeY3uIf pic.twitter.com/x2ZUI3SHXX