"Witness The Unspeakable! Billy and Mandy Encounter The Space Invaders"
Alien werewolves from the Moon attack Earth and steal all the cheese. It's up to Mandy, Grim, Billy, and Sperg to stop the alien ploy.
Grey DeLisle
Mandy / Castigator (voice)
Greg Eagles
Grim / Sperg (voice)
Richard Steven Horvitz
Billy / Billy's Dad (voice)
Vanessa Marshall
Irwin / Mouse (voice)
Dee Bradley Baker
Alien Moonbeast / Alien Werewolf / Moonthing (voice)
Jeff Bennett
Alien #1 / Rat (voice)
Chris Cox
Meadowberry / Corporal / Postal Slob (voice)
Jennifer Hale
Billy's Mom / Stinky (voice)
Tom Kenny
Dr. Brainiac / Alien Pilot / Wiggly / Waiter (voice)
Mr. Lawrence
Alien #2 (voice)
Grey DeLisle
Mandy / Castigator (voice)
Greg Eagles
Grim / Sperg (voice)
Richard Steven Horvitz
Billy / Billy's Dad (voice)
Vanessa Marshall
Irwin / Mouse (voice)
Dee Bradley Baker
Alien Moonbeast / Alien Werewolf / Moonthing (voice)
Jeff Bennett
Alien #1 / Rat (voice)
Chris Cox
Meadowberry / Corporal / Postal Slob (voice)
Jennifer Hale
Billy's Mom / Stinky (voice)
Tom Kenny
Dr. Brainiac / Alien Pilot / Wiggly / Waiter (voice)
Mr. Lawrence
Alien #2 (voice)
