The Mighty World of Marvel #2

Igor, the captured spy, secretly contacts his master, the malformed Soviet scientist known as the Gargoyle, and informs him of the Hulk's existence. At nightfall, Banner's worst fears are realised and he transforms again, only to be captured by the Gargoyle, and he and Rick are taken to Russia. Journeying east towards the rising sun, however, triggers the Hulk's change back to Banner. Dr Banner realises he can cure the Gargoyle's affliction, and in return the now-normal scientist gives Bruce and Rick their freedom. After they leave, the Gargoyle destroys his stronghold and seemingly himself.