Odelecol Pretty good movie overall. First half was nothing special but it got better as it went along.

Ella-May O'Brien Each character in this movie — down to the smallest one — is an individual rather than a type, prone to spontaneous changes of mood and sometimes amusing outbursts of pettiness or ill humor.

Geraldine The story, direction, characters, and writing/dialogue is akin to taking a tranquilizer shot to the neck, but everything else was so well done.

Francene Odetta It's simply great fun, a winsome film and an occasionally over-the-top luxury fantasy that never flags.

adonis98-743-186503 An alien civilization is invaded by Astronaut Chuck Baker, who believes that the planet was uninhabited. Wanted by the military, Baker must get back to his ship before it goes into orbit without him. Planet 51 has a great and talented voice cast, good animation, jokes and an overall interesting concept that works plus some cool references to Alien and Terminator. The Characters are interesting and likable especially the main ones and the movie as a whole it's better than it gets credit for. (10/10)

jenniferhanemsu I don't often sell movies. If I pick up a movie whose premise looks engaging, usually it ends up being good enough to watch again, and I keep it. This one is an exception.I watched it because the premise -- a human finding himself playing the role of alien on another planet -- was intriguing. Unfortunately, the movie spends more time fooling around with slapstick and young love clichés than actually exploring that premise. The humor is silly/ridiculous as opposed to genuinely funny. The story feels shallow, and the emotional heart it could have had barely comes out. I really *wanted* to connect with some of the characters, especially Lem ... how could I not love a science-crazy teenager?! But it turned out to be difficult to care about them. I don't necessarily mind all of the cheeky references to other sci-fi films, but you've got to have more than that to build a movie on.Maybe I was setting my standards a little high by hoping that this would be another E.T., or a kid-friendly version of The Day the Earth Stood Still, with the human and alien roles flipped. But I've seen enough kids' movies that I would honor with an unqualified GREAT assessment that I don't think this one deserves a pass. Treat your kids to something that doesn't insult their taste.

SnoopyStyle Lem is just an average teenager except he's an alien on an alien world that resembles more like 50's middle America. He's bad at his job at the planetarium and has a crush on his neighbor Neera. An earth spaceship lands in their backyard and NASA astronaut Chuck Baker emerges. Meanwhile in the secret army Base 9, there is a room filled with Earth objects that have landed over the years. A Rover is activated and goes in search for the new arrival. Chuck is shocked at the inhabitants and run screaming into the planetarium. Lem befriends Chuck and tries to get him back to his ship. General Grawl and the army arrive to fence off the ship before Chuck could get there. Professor Kipple claims the alien could turn them into zombies.It's a perfectly fine idea of an inverted alien ET landing. The pop 50s reference could be funnier but this is simply boring. There is a real need for many more jokes. Looking at the credits, it looks like Joe Stillman is the only writer in the room. That is probably its biggest programs. It needs other writers to come and sharpen the jokes. This feels like a first draft with an interesting idea. The other problem is that the 50's reference are all old and nobody under 40 would get most of them, let alone the tiny ones.

Jackson Booth-Millard Alien invasion films have been around for years, seeing humans terrified by the Martian or elsewhere unknown beings and we don't know whether they are good or bad, and it was interesting to see a cartoon film taking the premise and reversing it, so humans are the invaders on an alien planet. Basically on Planet 51, a world populated by green aliens, in the town Glipforg set an era similar to the 1950's culture, average teenager Lem (Justin Long) has a job as the planetarium and has had a crush on Neera (Jessica Biel) for a long time, but he keeps getting interrupted by her hippie friend Glar (Alan Marriott) before he can speak his feelings, and he assumes Glar is her boyfriend. The world is about to change dramatically by the arrival of human astronaut Captain Charles 'Chuck' T. Baker (Dwayne 'The Rock' Johnson) who has travelled a very long way from Earth to claim the planet he has found in the name of the United States, obviously spotted by the inhabitants he is the alien, not them. Thankfully Lem, eventually, is willing to let the human stay in his house and away from the media spotlight that will brand him a monster and a danger to the planet, all Chuck wants is to place his flag in the planet's soil, gather some evidence of his visit, and return to Earth as a hero with many screaming fans. Keeping out of sight from the rest of the alien race is not easy though, and when he is found out he is indeed made out to be a threat, especially General Grawl (Gary Oldman) who is happy to put him in the hands of mad Professor Kipple (John Cleese) and see him be exterminated. In the end, the human proves himself a good visitor to Planet 51 after saving the life of the General, he is allowed to go back to Earth and achieve his ambition, his faithful wheeled artificially intelligent probe Rover is allowed to stay on the planet as the best friend of Skiff (Seann William Scott), and Lem and Neera finally express their feelings for each other. Also starring Freddie Benedict as Eckle, Mathew Horne as Soldier Vesklin and James Corden as Soldier Vernkot. The voice casting is good as you can expect from a film like this, Johnson making a suitably daft astronaut and Long as the hopeless in love teen, the characters are all good fun, many of the laughs coming from the robot Rover, the story is simple to understand, and you can spit and giggle at the small spoofs of famous sci-fi films, like Alien, War of the Worlds, 2001: A Space Odyssey and The Terminator, it may be a little predictable, but the kids will love, and there is just about enough enjoyment for the grownups, a fun family animated fantasy comedy. Worth watching!