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Ibac's alter-ego is Stanley "Stinky" Printwhistle, a crook who attempted to blow up a bridge, but was caught in the explosion. He is saved by Lucifer, who offers Printwhistle the chance to become a champion of evil in exchange for his mortal soul. Printwhistle accepts, and is told to speak the magic word "IBAC". By doing so, the frail, grey-haired criminal transforms into Ibac, a brutal muscleman with a buzz cut. Saying "IBAC" again transforms Ibac back into Printwhistle. Because he hasn't been able to defeat Captain Marvel, Printwhistle has not been obliged to give his soul to the devil, and has reformed, but being weak-willed, he has often been forced by other criminals into becoming the evil Ibac again.
While Captain Marvel is empowered by six mythological and Biblical figures, Ibac is empowered by four of the most evil and terrifying men to have ever walked the earth: Ivan the Terrible, who supplies Terror, Cesare Borgia, who gives Ibac Cunning, Attila the Hun, who gifts him with Fierceness, and Caligula, the sponsor of Cruelty. Also, while Captain Marvel transforms using magic lightning bolts, Ibac's transformations are accomplished with the power of mystical green fire and brimstone.
Ibac is seen among the captured villains in Salvation Run.
Power of Ibac: In order to change form, Stanley must be able to call upon the name of Ibac.
I for the Terror of Ivan the Terrible (Superhuman Stamina)
B for the Cunning of Cesare Borgia (Superhuman Durability)
A for the Fierceness of Attila the Hun (Superhuman Strength)
C for the Cruelty of Caligula (Superhuman Endurance)
Kid Super Power Hour
Ibac appears in The Kid Super Power Hour with Shazam! episode "Best Seller." He sends the Marvel Family a special book which is a transporter that enabled the Hiss-Men to capture Billy Batson, Mary Batson, and Freddy Freeman while they are sleeping, and bring them to Ibac with their mouth's gagged. He plans to attack humanity in pre-historic times, allowing the Hiss-Men to take over by using a device which turns humans into Hiss-Men and kidnapping humans from the present, but is defeated and left in the past being chased by a dinosaur while the Marvels take the technology.
Batman: The Brave and the Bold
Ibac makes a brief cameo in Batman: The Brave and the Bold episode "The Malicious Mr. Mind." He is seen as one of the members of The Monster Society of Evil fighting against the Marvel Family and Batman.
Ibac is mentioned in the episode "Misplaced" in a news report which talks about how he and Sabbac were defeated by Captain Marvel earlier in the day.