(Shazam! I #4) - Sterling Morris sent Billy Batson out with his tape recorder for some man on the street interviews, but when a girl wandered onto a construction site Billy had to change into Captain Marvel to save her from some falling debris. He turned back into Billy and ran into Stanley Printwhistle, who was working as a street-sweeper. Stanley told Billy he'd been released from jail a decade ago, and had gone straight. Atilla the Hun, Borgia, Caligula and Ivan The Terrible watched their former charge from limbo, and were disgusted that he'd reformed. They were determined to force him into becoming Ibac again to destroy Captain Marvel, so they sent their evil thoughts into Stanley's head, compelling him to speak the magic word. Ibac knocked out Billy, gagged and bound him, and placed him in a building on the construction site that was about to be demolished. Billy woke, and remembering his tape recorder had been recording the last time he changed into Captain Marvel, replayed his voice saying Shazam! and turned into Captain Marvel just in time. After a tremendous clash Captain Marvel defeated Ibac, and the evil spirits in Limbo decided to withdraw their power from their charge, turning Ibac back into Stanley. Stanley promised he'd never say the word Ibac again, and Captain Marvel trusted him.

Ivan the Terrible (Earth-S) was originally published by Fawcett Comics, which DC obtained the rights to in 1972.

Ivan the Terrible was a historical figure. For more information see https://en.wikipedia.org/wiki/Ivan_the_Terrible.

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