Why it's Hot:
- Cover art by Dave Cockrum and Terry Austin
- 1st appearance of Mutant X (Proteus)
- Mastermind appearance
- Magneto cameo
- White Pages
Synopsis:
Jean Grey is residing on Muir Island, where Moira MacTaggert tests her strange Phoenix powers, unaware that a dangerous, hunger-driven entity known as Mutant X (Proteus) has escaped confinement. Meanwhile, Jean, believing her X-Men teammates are dead, experiences a vision of the 18th century before being attacked by the escaped entity. Back at the X-Mansion, the team continues their rigorous training in the Danger Room, oblivious to the threat.