In his first Silver Age appearance in "Shazam" #4 (July 1973), the spirits of the villains who gave him his powers telepathically communicate with him, and force him to become Ibac as he has reformed and been a street sweeper for the last ten years. They order him to capture, then destroy, Billy. He succeeds in surprising, capturing, and leaving a bound and gagged Billy in a building about to be blown up, but Billy is able to use a recording of his voice to summon Captain Marvel and beat up Ibac. After being defeated, his benefactors withdraw their powers from him. However this may not be possible Post-Crisis. Ibac was a member of both the Pre-Crisis Monster Society of Evil during WW II, in which he nearly killed Billy in Africa after giving him bound and gagged to cannibals, and the Society formed years later.