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| Publisher |
Marvel |
| Artist |
Don Heck |
| Writer |
Roy Thomas |
| Published | February 1968 |
"Now Strikes...the Sub-Human!" The X-Men fight against the Grotesk, the last survivor of a race (the Sub-Humans) that once had lived in the interior of Earth. Jack O'Diamonds wants Scott Summers to help him with his evil plan and to fight against Professor Xavier. Jack O'Diamonds successfully turns himself into a Living Diamond.