Estimated grading based on condition: VF, 8.0-8.5
Key Issue Details
- 1st full appearance of Proteus
First Printing: June 1982
Writers: Chris Claremont and John Byrne
Art: John Byrne and Terry Austin
The X-Men return to Muir Island to investigate the attack on Polaris and Havok. When they get there they find themselves in a deadly battle against arguably the most powerful and deadliest mutant alive - Mutant X!