News Summary

• Mister Sinister is the most prolific X-Men villain who hasn't appeared in live-action yet.
• He joins Christopher Abbott as Professor X, Kit Connor as Cyclops, Sadie Sink as Jean Grey and Inde Navarrette as Rogue.
• "X-Men" co-writer Lee Sung Jin has previously said he and director Jake Schreier intend to lean into the soapier side of the comics.
• If Sinister sticks around, we could see the MCU adapt storylines like "The Mutant Massacre," where Sinister sends his Marauders to kill the sewer-dwelling mutants the Morlocks.