Robert Knapp

Adam-12

Sgt. Casey

1968

The Invaders

Congressman Joe Bonning

1967

The Invaders

Lt. Col. Howell

1967

Black Saddle

Emory Parsons

1959

Behind Closed Doors

Fred Lang

1958

Tomahawk Trail

Pvt. Barrow

1957

Revolt at Fort Laramie

Lt. Chick Waller

1957

Fixed Bayonets!

Chuck (uncredited)

1951

The Rawhide Trail

Farley Durand

1958

Mesa of Lost Women

Grant Phillips

1953

Gunmen from Laredo

Gil Reardon

1959

Hot Car Girl

Det. Lt. Ryan

1958

The Threat

Steve Keenan

1960

Screaming Eagles

Co-Pilot

1956

Strange Fascination

Jack

1952

The Stoolie

Big daddy at pool (as Robert 'Big Daddy' Knapp)

1972

Outlaw's Son

Striker

1957

Silent Raiders

Lt. Finch

1954