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Official Site: DC Comics

Ibac is a fictional Fawcett Comics and DC Comics supervillain, and a foe of Captain Marvel. Created by writer Otto Binder and artist C.C. Beck, he first appeared in Captain Marvel Adventurs #8 (March 6, 1942).

Ibac's alter-ego is Stanley "Stinky" Printwhistle, a crook who attempts to blow up a bridge, but is caught in the explosion and thrown off due to Captain Marvel. Pre-Crisis he was dropped off by Cap. He is saved by Lucifer, who offers Printwhistle the chance to become a champion of evil and defeat Captain Marvel in exchange for his mortal soul. Printwhistle accepts, Lucifer summons up four historical villains, and Printwhistle 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. When he first appears he is defeated when Captain Marvel hits him so hard he seems to knock the evil power from him, in the form of leaving Printwhistle and the four other villains in front of him, the four fade away quietly, but Ibac later returns when the evil spirits contact him. Captain Marvel whirls Ibac around so fast that the four evil spirits separate from him. Because he has not 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. 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 succeeded in surprising, capturing, and leaving a bound and gagged Billy in a building about to be blown up, but Billy was 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 able to happen Post-Crisis. Ibac was a member of the Pre-Crisis Monster Society of Evil during WW II, where he nearly killed Billy in Africa after giving him bound and gagged to cannibals, and the one formed years later.

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. While Captain Marvel transforms using magic lightning bolts, Ibac's transformations are accomplished with the power of mystical green fire and brimstone. This also gives him superhuman strength and stamina. In his second appearance in Captain Marvel Adventures #9 Beautia Sivana saying 'Ibac' next to Ibac after his transformation transforms her into a black haired woman wearing a black dress, though she still has her own personality and turns back when saying 'Ibac' again. In Justice League of America #135 (October 1976) Ibac is one of the villains of three Earths working for King Kull. Spy Smasher battles Ibac, and is on the verge of losing when he remembers what Captain Marvel told him of the villain. Spy Smasher then taunts the dim-witted villain, telling him to "back down". Ibac responds proudly: "I back down for nobody!" The phoenetic "I back" causes him to revert to Stinky Printwhistle's form. In Shazam #29 (May–June 1977), his original benefactor Prince Lucifer gives him greater power briefly, but he turns back on purpose to escape the affections of villainess Aunt Minerva after getting advice from Solomon.

Before the Crisis on Infinite Earths, Ibac is a member of the Monster Society Of Evil, a team of Captain Marvel's greatest enemies, and joined the first Silver Age version. More recently, he has turned up in Villains United as a member of the Secret Society of Super Villains.

Ibac has not been a contender in any CBUB matches.