Batman #156

THE SECRET OF THE ANT-MAN

Batman is away on a special assignment, and leaves Robin the task of patrolling Gotham City. He befriends a tiny, costumed hero called Ant-Man whom he mistakenly suspects might be Batman. He later discovers that the Ant-Man is actually a mobster named Jumbo Carson and apprehends him.

ROBIN DIES AT DAWN

Batman volunteers to participate in a special military experiment to test the long term effects of isolation on the human psyche. During this experience, Batman suffers a hallucination in which he witnesses Robin being killed on an alien world. The hallucinations persist and Batman is so overwrought that he is incapable of continuing his work. He hands the responsibility of safeguarding Gotham City to Robin. A criminal cartel known as the Gorilla Gang encounter Robin and abduct him. Batman is forced to come out of retirement to rescue him. The mission emboldens Batman's confidence and he stops having hallucinations.