Sid is a yellow and white Giant Ground Sloth who is the founder of The Sub Zero Heroes. He is one of the protagonists of the Ice Age movie franchise.
Sid is clumsy, annoying, slow moving, fast-talking, naive, clumsy, loyal and funny member with a good heart, and is voiced with a lateral lisp. Little is known from Sid's life other than that Sid once lived in a tree with other sloths that always wanted to leave Sid behind when the migration occurred, using several different ways to leave him behind. What is clear is that Sid's mother always told him that "bad news is just good news in disguise" prior to abandoning him for good. He accidentally starts a fire in the first film and learns how to do it properly towards the end; he also shows this skill in the second film, where he is worshiped by a tribe of "mini-sloths" who call him "Fire King" and try to sacrifice him. In the third film, he adopts a trio of baby T-Rexes, and is forcibly taken to the underground dinosaur land by their mother, requiring the others to come and save him. In the fourth film, it is revealed that his full name is Sidney, though this name was also used in a deleted scene of the first film. When he, Diego and Manny are on the ice and are forced up by a water spout, they see a rainbow in the bright blue sky as he told them that "there is a rainbow at the end of every corner."
A mechanical version of Sid appears in Robots during the miming scene.
Sid was built along the form typical of ground sloths, short, brushy tail, clawed hands and feet, a long thin neck, ovular head with bulbous eye on both sides and a pair of buckteeth. Sid’s right front tooth was slightly bigger than the left, similar to his right eye, which was also somewhat bigger than the left, both eyes of which were pale green. Sid’s pelt was dirty and tan, and became brown when the fungus it carried dried out, Sid attributing the state of his pelt to his vegetarian diet, which he said led to a younger-looking pelt. In his films, Sid faints at certain times when he's getting hit - e.g. he faints when he gets hit on the nose by a block of ice and apparently get his tongue stuck to the floor of an ice cave.