"Stinky" Printwhistle planned to blow up a bridge and then loot the oncoming train. The plot was foiled by Captain Marvel, who threw "Stinky" off the bridge. In a deal with Lucifer, Printwhistle sells his soul for the power of the most evil men in history. He fights Captain Marvel on several occaisons; the first of which, he was defeated by Captain Marvel knocking the evil spirits out of him. Ibac was also a member of Mister Mind's Monster Society of Evil.

Upon saying "Ibac!", Printwhistle is transformed by green fire into Ibac - possessing from the evil spirits:
*Ivan the Terrible - Terror
*Cesare Borgia - Cunning
*Attila the Hun - Fierceness
*Caligula - Cruelty

In addition, Ibac also has superhuman strength and stamina. Saying "Ibac" again, will transform him back into Printwhistle (as a result, prevents him from saying his own name without losing his power).

*Captain Marvel Adventures #8-9, 22-23
*America's Greatest Comics #5

*Ibac shouldn't be confused with Sabbac, a Captain Marvel Jr. enemy with a similar hellish origin and powers.

*[https://web.archive.org/web/20200813013432/http://free-universe.myartsonline.com/IBAC.html Free Universe (Archive)]
*[http://www.marvelfamily.com/WhosWho/whoswho.aspx?castID=32 The Marvel Family Web]
*[http://en.wikipedia.org/wiki/Ibac Wikipedia]
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