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Raymond "Ray" Stantz, Ph.D., is a fictional scientist and member of the Ghostbusters, appearing in the films Ghostbusters, Ghostbusters II, and Casper (played by Dan Aykroyd) and in the animated television series The Real Ghostbusters (voiced by Frank Welker).
The team includes the stuttering Caboose (voiced by Frank Welker), the uptight Winston (voiced by Peter Cullen in an English accent), Reginald AKA Reggie (voiced by Mendi Segal impersonating Jack Nicholson), Barney (voiced by Dave Coulier in a Southern accent), Ditzy Kibble (voiced by Ellen Gerstell), Satch (voiced by Jim Cummings impersonating Ed Wynn), and a friendly Chihuahua named Tweek (voiced by Hank Saroyan).
Viper (voiced by Frank Welker) - Dr. Elrod Purvis once worked at Megakat Biochemical Labs alongside his partner Dr. N. Zyme.
Four aliens - Gleep (Paul Williams), Romtu (Don Messick), Scoota (Frank Welker), and Bing (Frank Welker) have been sent to Earth from the planet Mars in order to find a rare material known as "coobi" (which is later revealed to be candy).
The game features the voice cast from the show such as Peter Cullen, Frank Welker, Sumalee Montano, Steven Blum, Josh Keaton, Jeffrey Combs, Kevin Michael Richardson, and Daran Norris.
Mort, Gort, & Wart (voiced by Frank Welker, Thom Huge, and Howard Morris, respectively): Orson's three larger, meaner brothers who played a much bigger role in the cartoon than they ever did in the comic strip, where they were unnamed.
For his appearances in commercials that aired in the 1970s and 1980s, Woodsy was voiced by several different actors, including Sterling Holloway, Barry Gordon, Dave Kimber and Frank Welker.
Yukk!'s character is voiced by Frank Welker, years before he won the role as the voice of Megatron in the Transformers cartoon series — alongside his colleague Peter Cullen, who was the voice of Megatron's enemy, Optimus Prime, and who provided the voices of Mighty Man and his alter ego Brandon Brewster in this cartoon series.
Dynomutt and Blue Falcon appear in another Scooby-Doo crossover, Scooby-Doo! Mask of the Blue Falcon with Frank Welker reprising his role of Dynomutt.
This is the last time Scott Innes does the voice of both Shaggy and Scooby as Casey Kasem would re-assume the role of Shaggy for the next film, and Frank Welker offered to voice Scooby, therefore, Innes was no longer needed.