The Beast's villainous turn has been a problem for the X-Men these last few months. Aside from jeopardizing Krakoa's relationship with the rest of the world, Beast has already started a new conflict with Wolverine. Even now though, some members of the X-Men still have doubts if Beast is truly a monster now. X-Force #41 (by Benjamin Percy, Paul Davidson, GURU-eFX, VC's Joe Caramagna, Tom Muller, and Jay Bowen) makes this clear when Colossus questions whether the Beast they face now was truly himself, and not the result of a defect or alteration.
Source：https://www.cbr.com/xmen-beast-villainous-turn-colossus-hope/
