It first appeared as the primary antagonist of the animated film The Last Unicorn.
Disney Vs Non Disney Villains War
Vs The Lava Titan
In this war, after the death of king Haggard somehow the red bull came into the hands of Eris. She made it one of her titans. During the final days of the war, Eris unleashed her titans on Hades's titans. The Bull charged at the Lava Titan who covered him in lava, melting him.
Non Disney Villains Tournament
Taking The Form Of His Master
After King Haggard was at defeated by Skeletor's forces, Queen Juliana, the wife of King Haggard in this war, transforms her husband into a more powefull blazing animal, in the form of the Red Bull. At first the Bull unleashed a big roar that sends Skeletor flying several feet away. Just as Skeletor recovers his powers, the Red Bull charges at full speed at the warrior. Although one of Skeletor's warriors, the Beast Man, challenge the Bull, the beast easily defeted him. Unfortunately, Evil Lyn, the only one sorceress of Skeletor's forces, used her magic to revert the powers Queen Juliana had casted to her husband, causing the monster to revert back into the king's normal self.