Fantastic Planet (French: La Planète sauvage, lit. The Savage Planet) is an animated 1973 science fiction film directed by René Laloux. The film was an international production between France and Czechoslovakia and has been distributed in the United States by Roger Corman. It won the special jury prize at the Cannes Film Festival in 1973. The story is based on the novel, Oms en Série, by the French writer Stefan Wul.
Hommie Erik showed this to me and it blew my mind...
its definitely a must see.
and the plot, well its best you don't know the plot before watching it.
peep the trailer.
You can watch the whole thing in 8 parts on youtube.