It's the details that stand out whenever a classic film is converted to 3-D.

With "Finding Nemo," images pop off the screen: the shimmering sea surface, scratches on the lens of a diver's goggles, and smudge marks Nemo the clownfish makes when he mashes his face up against the glass wall of the aquarium that imprisons him in the 3-D reissue of Pixar's undisputed masterpiece.

The fish seem to float between the surface of the screen and the deep blue underwater backgrounds of the South Pacific, an effect even more pronounced in 3-D.

If you have kids, you already have this video at home. But "Finding Nemo," back in theaters nine years after its release, is a reminder that sometimes "instant" and "classic" can go together in a sentence describing a great movie.

And "Finding Nemo" is a great movie, one of the best animations for children ever made.

A timid and overprotective single-dad clownfish (Albert Brooks) overprotects his mildly disabled (shrunken fin) only son (voiced by Alexander Gould) to the point where Nemo foolishly rebels and is promptly snatched and tossed into the tank at an Australian dentist's office.

Dad flees the comfort of his reefside home, and with the help of a seriously absent-minded blue tang named Dory (Ellen DeGeneres), sets out to find his son. And the kid, with the help of a tank full of mentors (Willem Dafoe, Brad Garrett, Allison Janney, Austin Pendleton), plots his escape to get back to dad.

It's a simple story, perfectly executed. Especially when it comes to the voices.

Dory – all halting, self-interrupting comical kvetching, written specifically for DeGeneres and animated around her gestures – steals the movie.

"I suffer from short-term memory loss. It runs in my family … At least I think it does … hmm. Where ARE they?"

It's a grand quest filled with funny, broadly-drawn but wise characters – sea turtles that speak "Surfer Dude," Australian sharks trying to turn vegetarian (Barry Humphries, and see if you recognize Eric Bana), a helpful, plucky pelican (Geoffrey Rush).

And what wonderful messages. No matter what, "Just keep swimming." "Trust, it's what friends do." And kids: "You can't hold on to them forever."

So don't think of "Nemo" as just another 3-D conversion. Think of this re-release as an encore, a handy touchstone for you and your kids. "Finding Nemo" was and remains the gold standard against which all other modern animated films are measured, a classic from the day it premiered.

("Nemo" is preceded by the new Pixar "Toy Story" short "Partysaurus Rex," a hilarious dinosaur-out-of-water 'toon about the mild-mannered T-Rex toy (voiced by the ever-meek Mr. Wallace Shawn) who breaks out of his rut when he is picked to join the bath toys for a wild night of suds and excess.)

FINDING NEMO 3D

Four Stars (out of four)

Cast: Voices of Albert Brooks, Ellen DeGeneres, Willem Dafoe, Geoffrey Rush, Barry Humphries, Bill Hunter

Directors: Andrew Stanton and Lee Unkrich

100 minutes

Rated G

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