Sidney, better known as Sid, is tritagonist of Ice Age, Ice Age: The Meltdown, Ice Age: Continental Drift, the deuteragonist of Ice Age: Dawn of the Dinosaurs, a major character in Ice Age: Collision Course, and the main protagonist of the prime-time holiday specials. He is Manny and Diego's best friend and one of Peaches' adoptive uncles.
Sid was originally going to join the cast of Castaras, but was dropped.
He is voiced by John Leguizamo.
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