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Acting
Robert John Holthaus (December 28, 1928 – August 2, 1985), better known as Bob Holt, was an American actor, best known for his voice work. Holt's first film role came in 1950, acting as Octavius Caesar in Julius Caesar. His career as a voice artist began with the 1968 short film Johnny Learns His Manners, for which he provided all of the voices. He later appeared in such works as Bedknobs and Broomsticks, several animated television specials with Dr. Seuss, for example, The Lorax (1972), Dr. Seuss on the Loose (1973), The Hoober-Bloob Highway (1975) and The Grinch Grinches the Cat in the Hat (1982) and the animated film version of Charlotte's Web as Homer Zuckerman. Holt appeared in a variety of different works, including animated films for both adults (the 1974 sequel The Nine Lives of Fritz the Cat) and for children, as well as voice and acting work in live-action films (for the blaxploitation film Abby, Holt provided the voice of the Demon). In 1975, he was the voice of Grape Ape on The New Tom and Jerry Show. The same year, Holt provided the voice of Avatar in Ralph Bakshi's film Wizards. Avatar's voice was an imitation of actor Peter Falk. In 1982, Bob Holt played the title role in Marvel Productions' animated The Incredible Hulk (1982 TV series), also in the process creating a library of stock roars that would be used for many years afterwards.

The DePatie/Frelang Collection: Sheriff Hoot Kloot
as Sheriff Hoot Kloot (voice) (archive sound) (uncredited)

The Adventures of the American Rabbit
as Rotten Rodney (voice)

Disney's Adventures of the Gummi Bears
as Dom Gordo of Ghent

The 13 Ghosts of Scooby-Doo
as Zagraz (voice)

Challenge of the GoBots

Snorks
as Mr. Seaworthy

Gremlins
as Mogwai / Gremlins (voice)

Disney's Wonderful World of Winter
as Stanley Slush

The Biskitts

Peter and the Magic Egg
as (voice)

The Incredible Hulk
as The Hulk (voice)

Flash Gordon: The Greatest Adventure of All
as Dr. Hans Zarkov (voice)

The Grinch Grinches the Cat in the Hat
as The Grinch / Waiter / The Grinch's Mother (voice)

Puff the Magic Dragon: The Incredible Mr. Nobody
as Father (voice)

Dennis the Menace in Mayday for Mother
as Henry Mitchell (voice)

Strawberry Shortcake in Big Apple City
as Coco Nutwork (voice)

Challenge of the Super Friends

The Mouse and His Child
as Muskrat (voice)

Scooby's All-Stars

Wizards
as Avatar (voice)

The Scooby-Doo/Dynomutt Hour
as Additional Voices (voice)

Medicur
as Dogfather / Rocky McSnarl / Doctor (voice)

Rockhounds
as Dogfather / Pug / Boy (voice)

The Great Grape Ape Show

The Oddball Couple

Goldilox & the Three Hoods
as Dogfather (voice)

The Day of the Locust
as Tour Guide

Eagle Beagles
as Dogfather (voice)

From Nags to Riches
as Dogfather / Pug (voice)

Haunting Dog
as Dogfather (voice)

M-O-N-E-Y Spells Love
as Dogfather / Pug / Rocky / Priest (voice)

Rock-A-Bye Maybe
as Dogfather (voice)

Watch the Birdie
as Dogfather / Pug (voice)

Saltwater Tuffy
as Dogfather / Pugg (voice)

The Hoober-Bloob Highway
as Mr. Hoober-Bloob (voice)

Deviled Yeggs
as Dogfather / Pug (voice)

Bows and Errors
as Dogfather (voice)

Abby
as The Demon (voice)

Mother Dogfather
as Dogfather / Pug (voice)

The Big House Ain't a Home
as Dogfather / Pug (voice)

Heist and Seek
as Dogfather / Pug / Translator (voice)

The Goose That Laid a Golden Egg
as Dogfather / Pug (voice)

The Nine Lives of Fritz the Cat
as Various Characters (voice)

Hong Kong Phooey

Oliver Twist
as (voice)

The Dogfather
as Dogfather (voice)

The Dogfather
as Dogfather (voice)

Mesa Trouble
as Hoot Kloot / Fester / Townspeople (voice)

Saddle Soap Opera
as Hoot Kloot / Fester (voice)

The Badge and the Beautiful
as Hoot Kloot / Fester (voice)

Big Beef at the O.K. Corral
as Hoot Kloot / Fester (voice)

Strange on the Range
as Hoot Kloot / Fester / Billy the Kidder (voice)

By Hoot or By Crook
as Hoot Kloot / Fester (voice)

As the Tumbleweed Turns
as Hoot Kloot / Fester / Railroad President (voice)

Giddy Up Woe
as Hoot Kloot / Fester / Robber / Alf Willett (voice)

Gold Struck
as Hoot Kloot / Fester (voice)

Phony Express
as Hoot Kloot / Fester / Mailman / Thief / Horse / Postmaster (voice)

The Bear Who Slept Through Christmas
as Santa Claus (voice)

B.C.: The First Thanksgiving
as Wiley / Grog

Stirrups and Hiccups
as Hoot Kloot / Fester / Mild-Bill Hiccup / Wild-Bill Hiccup / Wyatt Earp (voice)