After braving the lizard-creature infested sewers beneath?Manhattan, Spider-Man reveals to the X-Men just exactly who they are up against. But this doesn't explain the rash of disappearances of outcast teenagers. Why have they vanished, and what do these kids have in common? The X-Men must use their best detective skills to discover the secret, but nothing prepares them-or Spider-Man-for the surprise villain who is pulling all the strings. 32 PGS