Red-Horn was the leader of a pack of ceratosaurs who lived in the deeper parts of the chasms in the dinosaur world. As the leader of the ceratosaur pack, Red-Horn was the biggest. Like Buck, he held a grudge on Rudy for the loss of half his pack and was still angry at the losses. Even if his pack would die off soon, he was within all odds, intending to bring down Rudy. The others in the pack felt that they were being wronged and made it their goal to kill Rudy in vengeance. He also seemed to know about Flood and her grandfather. At the end of Ice Age: The Time Kids, Red-Horn was killed in a fight against Rudy, when he shoved off a cliff into a deep canyon. He appears in Open season/Ice Age crossover as the primary antagonist.