The Incredible Hulk #6

In "The Incredible Hulk vs The Metal Master!", the Hulk—still wrestling with the unpredictable effects of his gamma experiments—faces a terrifying alien threat whose power defies even his strength. When his transformation falters and his human form remains, the Hulk must rely on Banner’s mind and ingenuity to outwit the Metal Master, leading to a daring breakout and an unexpected stand against an alien force unlike any he’s faced. Written by Stan Lee and illustrated with bold, eerie precision by Steve Ditko, with colors by Stan Goldberg and letters by Art Simek, the cover by Ditko captures the clash in stark, unforgettable detail.