Artist: Dave Cockrum, Paul Smith, and John Romita Jr.
Publisher: Marvel Comics (2003)
Includes: The Uncanny X-Men #148, 169, 170, 176-179
Caliban was the first mutant fan stalker, both figuratively and literally! The fact he got Kitty to marry him and in a really gross way, "do it or the man you love dies!" is just perfect.
Add a cool fight with The Brotherhood of Evil Mutants where Colossus almost dies and well...'nuff said.