Get it now:

One of the first things i'm getting when i'm home again, info from imdb:

The Planet Express crew must work to fix rips between their universe and another inhabited by a planet-sized, tentacle alien which soon takes over the Earth and uses it's ability to control Fry to command an entire religion which takes over and convinces the inhabitants of Earth to abandon the Earth to live in a pseudo-heaven, leaving the robots of the world to inherit the planet.