"When Titans Clash!" reprints X-Men (1963) #29
The team enjoys a few moments of R&R as Scott tries to control his optical blasts but instead awakens a new enemy, the Super Adaptoid. Meanwhile, back at the institute, Cal Rankin, aka the Mimic, is dismissed from school by Professor X. However, as he leaves, the X-Men are stunned by the Super Adaptoid, and it is the Mimic who comes to their rescue, defeating the Adaptoid.
Cover by Tuska and Colletta. Story by Thomas and Roth. 20 pages.