| 63 | X-Men (1st series) | 1st Appearance of Lorelei; 2nd Appearance of Barbarus; 2nd Appearance of Lupo; 2nd Appearance of Amphibius; 2nd Appearance of Gaza; 2nd Appearance of Brainchild; Origin of Lupo; Origin of Piper; Versus Magneto |
| 63-2 | X-Men (1st series) | 1st Appearance of Lorelei; 2nd Appearance of Barbarus; 2nd Appearance of Lupo; 2nd Appearance of Amphibius; 2nd Appearance of Gaza; 2nd Appearance of Brainchild; Origin of Lupo; Origin of Piper; Versus Magneto |
| 63 | X-Men (UK Edition) | 1st Appearance of Lorelei; 2nd Appearance of Barbarus; 2nd Appearance of Lupo; 2nd Appearance of Amphibius; 2nd Appearance of Gaza; 2nd Appearance of Brainchild; Origin of Lupo; Origin of Piper; Versus Magneto |