Plot: Scrat is once again trying to bury his acorn but accidentally activates an abandoned alien ship that takes him into deep space, where he unwittingly sends several asteroids en route to a collision with Earth. Meanwhile, Manny and Ellie are preparing upcoming marriage between Peaches and her fiance, Julian. Diego and his wife Shira want to start a family, but their fierce appearance tends to scare kids. Sid is dumped by his girlfriend, Francine, just as he is about to propose to her, and he laments his solitude. During Manny and Ellie's wedding anniversary party, some of the asteroids strike the place and The Herd barely escape. Meanwhile, at the underground lost world, Buck returns a dinosaur egg back to its rightful owner after it was stolen by a trio of flying tyrannosaurs named Gavin, Gertie, and Roger. Buck discovers an ancient stone pillar and takes it to the surface, where he meets Manny and the others..
Alternative Plot: Manny the mammoth starts to worry when his daughter Peaches announces her engagement. Still unlucky in love, Sid the sloth volunteers to plan the couple's wedding. To Manny's dismay, nothing can stop the upcoming nuptials, except maybe the end of the world. When Scrat accidentally launches himself into outer space, he sets off a chain reaction that sends an asteroid hurtling toward Earth. Now, the entire herd must leave home to explore new lands and save itself from Scrat's cosmic blunder.
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