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Frank Welker (b. 1945) is one of the most prolific cartoon voice actors of the last 30 years. His first famous role was that of Freddy Jones on Scooby-Doo, a role he has always played (with the exception of A Pup Named Scooby-Doo and the live-action movies).
His range extends to such varied characters as Slimer from The Real Ghostbusters, Megatron from The Transformers, Abu the Monkey in Disney's Aladdin, and Santa's Little Helper (the dog) on The Simpsons.
Welker's ability to mimic animal noises is so uncanny that he's frequently used in live-action movies and TV shows. He voiced the monkey in Raiders of the Lost Ark, Darwin the dolphin on SeaQuest DSV, and the title role in Jim Henson Pictures' Buddy, among many others.
Since his colleague Mel Blanc passed away in 1989, Welker has exclusively performed Barney Rubble and Dino in new Flinstones projects. He also occasionally performs Scooby-Doo himself in various projects, thus bringing his career full circle.
His inclusion in the Muppet Wikipedia stems from his portrayal of Baby Kermit for the Muppet Babies cartoon series.