Black Tom Cassidy

Few villains made a more memorable Bronze Age entrance than Black Tom Cassidy, who crashed onto the scene in The X-Men #99 in 1976, courtesy of the legendary creative partnership of Chris Claremont and Dave Cockrum. Over a publishing history stretching across 34 years, this Marvel menace carved out a persistent presence in titles like Generation X and New Excalibur, proving himself a durable thorn in mutantkind's side. He's the kind of character who gravitates toward serious trouble — his pages are shared with heavyweights like Juggernaut and Wolverine — and three of his appearances carry key-issue status, making him a genuine prize for Bronze Age collectors. If you love the rich, morally complex corner of the Marvel universe that Claremont built in the '70s and beyond, Black Tom Cassidy is absolutely worth tracking down.