Uncanny X-Men: Poptopia

Plot

Collects Uncanny X-Men #394-399

The X-Men have survived hatred, loss of life, and along the way helped save the world more than once. Still, they can never find peace as they all strive to achieve Professor Xavier's dream that man and mutant can peacefully coexist.

A wild, new evil mutant comes of age, celebrating his 18th birthday with all-out mutant mayhem. Who is Warp Savant and what famous event in X-Men history is he trying to recreate? By the time the team can answer this question, they have to jet to London so they can stop Mr. Clean, who calls himself a "genetic cleanser."