They weren’t much to start with, but the “Ice Age” movies are officially two or three installments past their expiration date with “Ice Age: Collision Course.”

A laugh-starved kids’ cartoon, it has nothing to recommend it to adults save for the opening credits confirmation that America’s Omnipresent Astronomer, Neil DeGrasse-Tyson, has finally jumped the shark.

He lends his opening narration to a science-averse comedy that has anthropomorphized mammals sharing the Earth with dinosaurs and a nutty squirrel in space thanks to “Ancient Astronauts.”

All in good “dumb” fun he assures us.

Only it isn’t. The critters face extinction — again — as meteors rain upon the Earth, the planetary “cleansing” that comes along every 100 million years or so, a wise weasel (Simon Pegg) informs the extended family of Manny the Mammoth (Ray Romano). Better take cover.

Jennifer Lopez classes up the clan as mate to saber-toothed Denis Leary. John Leguizamo gets all the worst one-liners.

“You are the wind beneath my…fleas!”

But Pegg, playing an eyepatch-wearing recurring character, provides a deliciously loony hint of where the laughs should have come from, songs — all of them derived from the “Marriage of Figaro.” That’s opera, Doc.

More Pegg, please. Less of everything else. But then, it’s too late for that. “Collision Course” is already a bomb.

MPAA Rating: PG for mild rude humor and some action/peril

Cast: The voices of Ray Romano, Queen Latifah, Jennifer Lopez, John Leguizamo, Denis Leary, Simon Pegg and Neil DeGrasse-Tyson
Credits: Directed by Mike Thurmeir, Galen T. Chu, script by Michael J. Wilson, Michael Berg, Yoni Brenner. A 20th Century Fox release.

Running time: 1:34