X-Men / WildC.A.T.s: The Dark Age

A one-shot crossover from 1998, co-published by Marvel and Image's Wildstorm imprint, X-Men / WildC.A.T.s: The Dark Age unites two superhero teams under the pen of Warren Ellis. Featuring art by Brett Booth and Mat Broome, the story offers a glimpse into a grim, alternate future where these iconic groups must contend with a world gone wrong. It stands as a notable, if brief, meeting of the two publishers' universes during the late '90s.