Planet 51 has a fantastically fresh premise: an astronaut lands on an alien planet where he’s perceived to be the invader. You’ve got your archetypal handsome, narcissistic moon man, Chuck Baker (Dwayne Johnson), but there’s an entire alien population to explore to put together an innovative group of curious creatures. For some bizarre reason, writer Joe Stillman opts to trash any ingenuity and model all of the aliens after complete stereotypes.