THE CANONICAL ENDGAME FOR JIMMY NEUTRON’S FRIEND SHEEN IS THAT HE STOLE JIMMY’S SPACESHIP, CRASHED IT, AND IS NOW INDEFINITELY STRANDED ON AN ALIEN PLANET, COMPLETELY CUT OFF FROM THE EARTH AND ALL OTHER HUMANS. THE SERIES WAS CANCELLED BEFORE THIS PLOTLINE COULD BE RESOLVED SO CANONICALLY NOBODY EVER WENT TO RETRIEVE HIM.