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Wally Cox was a beloved character actor who made his mark in television and ranks as one of the medium's most memorable performers. His ability to show his range likely was limited by his short stature, slight frame, and high-pitched voice, which along with his talent for being very funny, made him ideal for comedy parts such as his memorable turn as Professor P. Caspar Biddle in "The Bird-Watchers" episode of The Beverly Hillbillies (1962) in 1966. His television persona was that of a shy, timid man in horn-rimed glasses who spoke in a tentative, though distinctly enunciated, voice. It was a persona that his long-time friend Marlon Brando said was completely at odds with the real man. Cox always will be remembered as the eponymous "Mr. Peepers" and the voice of "Underdog," but he was an actor of wider talents seldom used by the industry, as can be seen in his turns as the sonar operator in The Bedford Incident (1965) and as the potential suicide Wally Haverstraw in The Bill Cosby Show (1969) episode "Goodbye, Cruel World" in 1970. Dying unexpectedly on February 15, 1973, from what some newspapers described as an accidental overdose of sedatives but which Marlon Brando in his autobiography said was a heart attack, Wally Cox's cremated remains were kept hidden in a closet by his old friend for three decades. According to Brando's son Miko, both his father's and Cox's ashes were scattered at the same time in Death Valley, California, in a ceremony following Brando's death, thus reuniting the lifetime friends.
Television: The First Fifty Years
as Robinson J. Peepers (archive footage)

Hollywood Heaven: Tragic Lives, Tragic Deaths
as (archive footage)

Reel Horror
as Clyde (archive footage)
Bob Hope's World of Comedy
as Self - Tribute Montage (archive footage)

The Night Strangler
as Mr. Berry

Once Upon a Mattress
as The Jester

Magic Carpet
as Harold Kane

Search

McMillan & Wife

The Barefoot Executive
as Mertons

Alias Smith and Jones

Up Your Teddy Bear
as Clyde King

Night Gallery

The Wacky Zoo of Morgan City
as Becker

The Odd Couple
as Mr. Fegivney

The Boatniks
as Jason

The Cockeyed Cowboys of Calico County
as Mr. Bester

The Young Country
as Aaron Grimes / Ira Greebe

Quarantined
as Wilbur Mott

Love, American Style
as Peter

The Bill Cosby Show
as Wally Haverstraw

The Glen Campbell Goodtime Hour
as Self

Here's Lucy
as Rock Barnett

The Dick Cavett Show
as Self - Guest

The One and Only, Genuine, Original Family Band
as Mr. Wampler

Rowan & Martin's Laugh-In
as Self (uncredited)

It Takes a Thief
as Tourist

A Guide for the Married Man
as Technical Adviser (Married 14 years)

Ironside
as Scoutmaster
Murder at N.B.C.

Hollywood Squares
as Self

Mission: Impossible
as Terry Targo

The Girl from U.N.C.L.E.
as Little John Doe

The Bedford Incident
as Seaman Merlin Queffle

Get Smart
as TV Repairman (uncredited)

Mister Roberts

Lost in Space
as Tiabo

I Spy
as Herbie

Morituri
as Dr. Ambach

The Yellow Rolls-Royce
as Ferguson

Fate Is the Hunter
as Ralph Bundy

Underdog

Underdog
as Underdog (Voice)

The Hollywood Palace
as Self
Bob Hope Presents the Chrysler Theatre

Burke's Law
as Count Carlo Szipesti
Vacation Playhouse
as Alfred

Spencer's Mountain
as Preacher Goodman

The Lucy Show
as Harold Tuttle

The Merv Griffin Show
as Self

The Tonight Show Starring Johnny Carson
as Self

The Beverly Hillbillies
as Professor P. Caspar Biddle

Something's Got to Give
as Shoe Salesman

State Fair
as Hipplewaite

The Mike Douglas Show
as Self

The Dick Van Dyke Show

The Twilight Zone
as James Elwood

DuPont Show of the Month
as Messenger 7013
The Lux Show
as Self

Wagon Train
as Vincent Eaglewood