In 2001, Nickelodeon produced an animated sci-fi feature film that was ahead of its time -- and yielded a spinoff TV series.
Toph, Katara, and Aang from Avatar: The Last Airbender along with Mako from The Legend of Korra, SpongeBob from SpongeBob SquarePants, Jimmy and Goddard from The Adventures of Jimmy Neutron, Boy ...