Diego is the tritagonist of the Ice Age franchise. He is a saber tooth tiger and one of Manny's best friends and one of Peaches' adoptive uncles. He becomes Shira's lover or husband in Ice Age: Continental Drift. He was the secondary antagonist, later supporting tritagonist of the first movie. He was advertised as its main antagonist, but this was a misinformation campaign to hide the true main villain. He is voiced by Denis Leary.