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.
- Power of IBAC: In order to change form, Stanley must be able to call upon the name of Ibac. Instead of magic lighting, Ibac transforms with green fire and brimstone.
- Stanley Printwhistle is often called Stinky Printwhistle.
- 17 Appearances of Stanley Printwhistle (Earth-S)
- 5 Images featuring Stanley Printwhistle (Earth-S)
- Quotations by or about Stanley Printwhistle (Earth-S)
- Character Gallery: Stanley Printwhistle (Earth-S)