Scooby-Doo and the Alien Invaders (2000)

Scott Innes (born October 1, 1966) is an American voice actor, author, songwriter and radio personality. He is best known for his voice over work in various Warner Bros. and Hanna-Barbera animated films, television shows, video games and commercials, most notably as Scooby-Doo, Shaggy Rogers, Scrappy-Doo, Popeye the Sailor, Fred Flintstone, Barney Rubble, Foghorn Leghorn, Muttley, Bugs Bunny, Yogi

Mary Kay Bergman (June 5, 1961 – November 11, 1999), also credited as Shannen Cassidy, was an American voice actress and voice-over teacher. Bergman was the lead female voice actress on South Park from the show's 1997 debut until her death. Throughout her career, Bergman performed voice work for over 400 television commercials and voiced over 100 cartoon, film, and video game characters.

Betty Jean Ward (born September 12, 1944), professionally known as B. J. Ward, is an American actress and voice actress. She is the creator and star of Stand-Up Opera, a musical one-woman show, as well as being a licensed aviator. She was also a Playboy Bunny at the New York Playboy Club in 1963.