This digital cartoon is a jokey reimagining of 1950s science fiction flicks where Earth faced extinction by alien space invaders seemingly on a monthly basis. By Kirk Honeycutt, The Associated Press ...

A high concept gets low execution in “Planet 51,” a lame-brained toon that even kids will recognize as an insipid goof on sci-fi conventions. Any number of things have been and could still be done ...

A Spanish animation studio, Ilion, gets into the kid-film sweepstakes with “Planet 51,” an underwhelming alien-invasion comedy. The twist? The invading alien, in this case, is an American astronaut.

A high concept gets low execution in “Planet 51,” a lame-brained toon that even kids will recognize as an insipid goof on sci-fi conventions. Any number of things have been and could still be done ...