- "We better be; I've just lost the steering!"
The father of a sloth named Sid, Milton was responsible, along with the rest of his family, for abandoning Sid while the rest of the family migrated off.
Milton, along with his family, had always been compelled to remain with Sid, who remained a nuisance to the others. Throughout the years, Milton and his family continued to try to leave Sid behind. One year, the family succeeded in stopping Sid from following them by gagging him with a field mouse, tying his hands and feet, barricading their cave entrance and moving through water so that Sid would lose their scent. Sid found them regardless, and joined them for another migration until the year that his family, Milton among them, woke up early and left Sid behind.
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Milton and his family, consisting of his wife Eunice, their son Marshall, the elderly family matriarch Granny, and the family's uncle, Fungus, returned to find Sid, traveling down the snowy mountains in a hollowed-out log which they had tied Granny to. During the ride, the log hit a saber-tooth tiger named Diego, who Eunice hit in the face before the family of sloths were compelled to hold on tight as the log hit a rock, flinging Diego towards the back of the log, as Milton and the others ducked.
Moments after, the log stopped and they were all flung out of it, nearly colliding with a number of other animals. Moments later, Milton's son Sid arrived on the scene, and was overjoyed at seeing his family again and embraced his parents and brother, who pretended.
At first, Milton and the rest of the family acted as though they were happy to see Sid again. But once they had Sid lead Granny away and both were out of earshot, Milton and the rest of Sid's family cheered aloud and rushed back to the log, pushing it towards another downhill slope. While Fungus and Milton were helping to push the log, Eunice explained to Manny, who called out that they couldn't simply abandon Sid again, that things were falling apart back home and that Granny was dead weight. The four sloths rushed off inland on their log, never to be seen again by Sid.
Like most of the rest of his family, Milton was shown to be very shallow; always attempting very hard to get rid of Sid, and abandoning Granny on Sid and then abandoning Sid with her again as dead weight without any empathy. He also appeared to be slightly slow, with Eunice needing to remind him to pretend to miss Sid with a slap.
Behind the Scenes
Milton was voiced by actor Alan Tudyk.