- John Henry Richardson
- Dr. Roland Masters
- Jake
- Puppy Murphy
- Michael Gaglio
- Cabin Man
- Jayden Hedden
- Ricky Hill
- Walker Mintz
- David Hill
- Jonathan Tysor
- Jeremy Tinsdale
- Sydney Thackray
- Jenny Linden
- Freddy John James
- Freddy
- Jaret Sacrey
- Jerry
- Jesse the Jack Russell Terrier
- Murphy
- Kurt Yaeger
- Steven Hill
- Robert Hummel
- Reenactment Dr. Masters / Billy Rand (as Robert E. Hummel)
- Teddy Hill
- Reenactment Murphy
- Errol Sack
- Orville Ketchum
- John Callahan
- Beeson Crowder
- Cindy Lucas
- Zoey Williams
- Paul Logan
- Jack Bowser
- Kristen Pate
- Natasha Bainbridge
- Delia Cirino
- Cookie Woman
- Ford A. Thaxton
- Train Sound Tech
- Dave Nichols
- Wilson
- Dominique Swain
- Amy Hill
- Dilan Patton
- Shelton 'The Brain'
- Bryan Clark
- Principal's Assistant
- Mark Tietsort
- Principal Callahan
- Charles Noland
- Anti-crab Gate Guard
- Zachary Cirino
- Cool Gate Guard
- Steve Altman
- Cockney Guard / Voice of Murphy
- Brad Roth
- Quiet Guard
- Ray Cirino
- Sky Sled Guard One
- Alexia Cirino
- Sky Sled Guard Two / TV Crew (as Lex C)
- Mark Banning
- Train Passenger
- Al Cirino
- Train Passenger
- Patrick Giraudi
- TV Crew
- Tony Randel
- TV Crew
- Korey Waggoner
- TV Crew
- Jim Wynorski
- Eye-witness