Justin Long
Lem (voice)
Dwayne Johnson
Chuck Baker (voice)
Jessica Biel
Neera (voice)
Seann William Scott
Skiff (voice)
Gary Oldman
General Grawl (voice)
John Cleese
Professor Kipple (voice)
Freddie Benedict
Eckle (voice)
Alan Marriott
Glar (voice)
Mathew Horne
Soldier #1 (voice)
James Corden
Soldier #2 (voice)
Alan Cumming
Alien Mailman (voice)
Frank Welker
Ripley / Rover (voice)
Jim Cummings
Lem's Dad (voice)
Renée Zellweger
Lem's Mom (voice)
