David Silverman	...	(Director)
James L. Brooks, Matt Groening	...	(Writer)
Dan Castellaneta	...	Homer
Barney	...	Grampa
Mayor Quimby	...	Multi-Eyed Squirrel
Mr. Teeny	...	Boy on Phone
Squeaky-Voiced Teen	...	Groundskeeper Willie
Julie Kavner	...	Marge Simpson
Nancy Cartwright	...	Bart
Ralph	...	Nelson
Yeardley Smith	...	Lisa
Hank Azaria	...	Professor Frink
Moe	...	Chief Wiggum
Carl	...	Cletus
Apu	...	Sea Captain
Harry Shearer	...	Scratchy
Rev. Lovejoy	...	Ned Flanders
President Arnold Schwarzenegger	...	Kent Brockman
Dr. Hibbert	...	Smithers
Kang	...
Pamela Hayden	...	Milhouse
Tress MacNeille	...	Sweet Old Lady / Colin /
Nelson's Mother	...	Pig
Cookie Kwan	...	Lindsey Naegle
Albert Brooks	...	Russ Cargill
Karl Wiedergott	...	Man / EPA Driver (voice)
Marcia Wallace	...	Mrs. Krabappel
Russi Taylor	...	Martin
Maggie Roswell	...	Helen Lovejoy
Phil Rosenthal	...	TV Dad (voice)
Billie Joe Armstrong	...	Himself (voice)

Comments: See our family. And feel better about yours.

Summary: Homer adopts a pig who's run away from Krusty Burger after Krusty tried to have him slaughtered, naming the pig "Spider Pig." At the same time, the lake is protected after the audience sink the barge Green Day are on with garbage after they mention the environment. Meanwhile, Spider Pig's waste has filled up a silo in just 2 days, apparently with Homer's help. Homer can't get to the dump quickly so dumps the silo in the lake, polluting it. Russ Cargill, the villainous boss of the EPA, gives Arnold Schwarzenegger 5 options, forcing him to choose 4 (which is, unfortunately, to destroy Springfield) and putting a dome over Springfield to prevent evacuation. Homer, however, has escaped, along with his family. Can he stop the evil Cargill from annihilating his home town, and his family, who have been forced to return to Springfield?