Frank Welker

Frank Welker is an American voice actor, specializing in animal and other creature vocal effects. Welker has been involved in many 1980's and 1990's cult cartoons, including Megatron and Soundwave on The Transformers (which he would later reprise for the 2010 series, Transformers: Prime), Doctor Claw from Inspector Gadget, and Slimer on The Real Ghostbusters. He was also Abu from Aladdin, Fall Apart Rabbit on Bonkers, and Nibbler in Futurama. Since the 2000's, he has been the voice of Garfield the cat and Curious George.

Scooby-Doo, Where Are You!
Grouped under "Voices".

The New Scooby-Doo Movies
For season 2, he was credited as Franklin Welker.

Laff-a-Lympics

 * Dynomutt

What's New, Scooby-Doo?
As Welker and Casey Kasem are the only two to reprise the roles they originated, they are included in the opening credits. Therefore, any additional roles are uncredited.

Be Cool, Scooby-Doo!
This is the first series to credit Fred's surname.

Scooby-Doo! The Mystery Begins
This was also produced simultaneously as a direct-to-video film.

Scooby-Doo! Curse of the Lake Monster
This was also produced simultaneously as a direct-to-video film.

Scooby-Doo on Zombie Island
This is the first Scooby-Doo to recognise Welker as the voice of Fred.

Scooby-Doo! Abracadabra-Doo
This is the first DTV film to include Fred's surname.

State Farm
Uncredited.

LEGO Scooby-Doo!
Uncredited.

Voice roles for Scooby-Doo in other media
Laff-a-Lympics was a show highlighted by Scooby-Doo('s involvement), so that doesn't count.

Johnny Bravo
Although not an official Scooby-Doo production, this is technically the first time Welker is recognised as the voice of Fred.

Notes/trivia

 * He's also appeared on-screen, with none other than Elvis Presley in the film, The Trouble with Girls, which also starred Nicole Jaffe.
 * Fred's interest in Elvis in What's New, Scooby-Doo?, may be an allusion to that.
 * In the What's New, Scooby-Doo? episode, A Scooby-Doo Valentine, he had a non-speaking cameo as the real identity behind a Hollywood extra pretending to be an evil Fred.