<P> After three months of futile escape attempts, Springfield's residents finally make a crack in the dome; pointing out the damage, Cargill manipulates Schwarzenegger into ordering the town's destruction . In Alaska, the Simpsons see an advertisement starring Tom Hanks for a new Grand Canyon on the site of Springfield; realizing the town is endangered, Marge and the children want to go back to save it, but Homer refuses to help the people who tried to kill him . After failing to talk Homer into it, his family eventually leave him for good . Alone, Homer is stranded on a slab of ice and floats away . Meanwhile, Marge and the children are captured by the EPA after a conversation of theirs is overheard by the NSA . After a mysterious Inuit shaman saves him from a polar bear, Homer has an epiphany and decides to return to Springfield to save the town from danger . </P> <P> As Homer arrives, a helicopter lowers a small but powerful bomb down a rope through a hole in the dome . While Homer climbs to the top of the dome, the townspeople attempt to climb the rope to escape through the still - opened hole, but Homer slides down the rope and knocks them off along with the bomb . After reconciling with Bart, Homer drives a motorcycle along the dome, inspired by the earlier carnival attraction . As a passenger of the motorcycle, Bart throws the bomb through the hole; seconds later it detonates, shattering the dome and freeing the town . Cargill arrives personally and prepares to kill Homer with a shotgun, but Maggie knocks him out with a boulder . The town finally praises and forgives Homer, who rides into the sun rise with Marge and Maggie, whereupon the townspeople restore Springfield to normal . As a symbol of their gratitude, the Simpsons and their friends begin to rebuild the family's house . </P> <Table> <Tr> <Th> Voice actor </Th> <Th> Credited roles </Th> <Th> Uncredited roles (in order of appearance) </Th> </Tr> <Tr> <Th> Dan Castellaneta </Th> <Td> Homer Simpson, Abe Simpson, Krusty the Clown, Groundskeeper Willie, Mayor Quimby, Sideshow Mel, Mr. Teeny, EPA Officer, Itchy, Barney Gumble </Td> <Td> Stage Manager, Blue Haired Lawyer, Multi-Eyed Squirrel, Hans Moleman, Panicky Man, Kissing Cop, Bear, Boy on Phone, NSA Worker, Officer, Rich Texan, Santa's Little Helper, Squeaky - Voiced Teen </Td> </Tr> <Tr> <Th> Julie Kavner </Th> <Td> Marge Simpson, Selma Bouvier, Patty Bouvier </Td> <Td> </Td> </Tr> <Tr> <Th> Nancy Cartwright </Th> <Td> Bart Simpson, Ralph Wiggum, Todd Flanders, Nelson Muntz </Td> <Td> Maggie Simpson, TV Daughter, Woman on Phone </Td> </Tr> <Tr> <Th> Yeardley Smith </Th> <Td> Lisa Simpson </Td> <Td> </Td> </Tr> <Tr> <Th> Hank Azaria </Th> <Td> Moe Szyslak, Chief Wiggum, Cletus Spuckler, Professor Frink, Apu Nahasapeemapetilon, Lou, Comic Book Guy, Captain McCallister, Bumblebee Man, Dr. Nick </Td> <Td> Carl, Male EPA Worker, Dome Depot Announcer, Kissing Cop, Carnival Barker, Gas Station Clerk, Drederick Tatum, EPA Passenger, Robot, Wiseguy </Td> </Tr> <Tr> <Th> Harry Shearer </Th> <Td> Mr. Burns, Smithers, Ned Flanders, Reverend Lovejoy, Lenny, President Arnold Schwarzenegger, Seymour Skinner, Kent Brockman, Dr. Hibbert, Otto Mann </Td> <Td> Scratchy, Skull, Toll Booth Operator, Guard </Td> </Tr> <Tr> <Th> Pamela Hayden </Th> <Td> Milhouse Van Houten, Rod Flanders, Jimbo Jones </Td> <Td> </Td> </Tr> <Tr> <Th> Tress MacNeille </Th> <Td> Medicine Woman, Agnes Skinner, Crazy Cat Lady, Colin, Cookie Kwan </Td> <Td> Sweet Old Lady, Mrs. Muntz, Plopper, Female EPA Worker, Lindsey Neagle, GPS Voice, TV Son, Girl on Phone </Td> </Tr> <Tr> <Th> Albert Brooks (as "A. Brooks") </Th> <Td> Russ Cargill </Td> <Td> </Td> </Tr> <Tr> <Th> Karl Wiedergott </Th> <Td> EPA Officer, Man </Td> <Td> </Td> </Tr> <Tr> <Th> Marcia Wallace </Th> <Td> Edna Krabappel (scenes deleted) </Td> <Td> </Td> </Tr> <Tr> <Th> Russi Taylor </Th> <Td> Martin Prince </Td> <Td> </Td> </Tr> <Tr> <Th> Maggie Roswell </Th> <Td> Helen Lovejoy </Td> <Td> Miss Hoover </Td> </Tr> <Tr> <Th> Phil Rosenthal </Th> <Td> TV Dad </Td> <Td> </Td> </Tr> <Tr> <Th> Billie Joe Armstrong </Th> <Td> Green Day (himself) </Td> <Td> </Td> </Tr> <Tr> <Th> Frank Edwin Wright III </Th> <Td> Green Day (himself) </Td> <Td> </Td> </Tr> <Tr> <Th> Michael Pritchard </Th> <Td> Green Day (himself) </Td> <Td> </Td> </Tr> <Tr> <Th> Joe Mantegna </Th> <Td> Fat Tony </Td> <Td> </Td> </Tr> <Tr> <Th> Tom Hanks </Th> <Td> Himself </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Voice actor </Th> <Th> Credited roles </Th> <Th> Uncredited roles (in order of appearance) </Th> </Tr>

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