I was going to suggest X-Men Origins: Wolverine, but it turns out there was also an M-rated X-Men FPS built in the Quake engine where you bloodily annihilate each member of the team(or their evil clones, apparently?) which was officially released by Marvel Interactive in 1997. What a time to be alive.
For anyone else wondering, Alex is thinking of Mega64’s GDC commercials, which is a 3 part series that I just saw after listening to this and is absolutely incredible. (The Deus Ex hacking video is a different, but also very funny thing)
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