During the 5 season run of X-Men: The Animated Series, the X-Men tangled with Mister Sinister on more than one occasion. Sinister did as Sinister does, harvesting mutant DNA for his experiments and slinking off into the darkness to live to haunt the X-Men another day. Another day is now, as Sinister has been revealed to be the big bad of the revival of X-Men: The Animated Series, X-Men ’97.
During Marvel Unlimited’s celebration of X-Men: 60 Uncanny Years, showrunner Beau DeMayo summed up what to expect from the series, which is expected to debut sometime in 2023.
Storm and Wolverine try to continue the X-Men. Magneto comes in and wants to step up for Charles Xavier. Sinister comes in to try to end the X-Men once and for all.
It sounds like a rewatch (or a first experience) may be in order for fans who might not remember why Magneto has to step in for Charles (Charles is in space) or why Sinister is so angry. In a response to the tweet embedded above, DeMayo indicated that while the summary is correct, an official and full synopsis will be revealed later in 2023.