Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Das grosse Krabbeln | 1998 | Mr. Soil |
| Actor | Planet der Affen | 1968 | Cornelius |
| Actor | Batman | Bookworm | |
| Actor | Flucht vom Planet der Affen | 1971 | Cornelius |
| Actor | Die Schlacht um den Planet der Affen | 1973 | Caesar |
| Actor | Die tollkühne Hexe in ihrem fliegenden Bett | 1971 | Mr. Jelk |
| Actor | Eroberung vom Planet der Affen | 1972 | Caesar |
| Actor | Fright Night - Die rabenschwarze Nacht | 1985 | Peter Vincent |
| Actor | Planet der Affen | Galen | |
| Actor | Overboard – Ein Goldfisch fällt ins Wasser | 1987 | |
| Producer | Overboard – Ein Goldfisch fällt ins Wasser | 1987 | |
| Actor | Der längste Tag | 1962 | Pvt. Morris |
| Actor | Cleopatra | 1963 | Octavian - Caesar Augustus |
| Actor | Das schwarze Loch | 1979 | V.I.N.CENT (voice) |
| Actor | Das Böse unter der Sonne | 1982 | Rex Brewster |
| Actor | Die Höllenfahrt der Poseidon | 1972 | Acres |
| Actor | Die Mafia kennt keine Gnade | 1975 | Tony Da Vince |
| Actor | Mein Nachbar, der Vampir | 1988 | Peter Vincent |
| Actor | Alles für die Katz | 1965 | Gregory Benson |
| Actor | Schlagende Wetter | 1941 | Huw Morgan |
| Actor | Die Katze aus dem Weltraum | 1978 | Mr. Stallwood |
| Actor | Heimweh | 1943 | Joe Carraclough |
| Actor | Die Klasse von 1984 | 1982 | Terry Corrigan |
| Actor | Piraten unter dem Doppelmond | ||
| Actor | Hinter den Kulissen von Planet der Affen | 1998 | Himself - Hosted by (also archive footage) |
| Actor | The Return of the King | 1980 | Samwise Gamgee |
| Actor | Die Todesparty 2 | 1989 | Mr. Dante |
| Actor | Die größte Geschichte aller Zeiten | 1965 | Matthew |
| Actor | It! | 1966 | Arthur Pimm |
| Actor | Tanz der Totenköpfe | 1973 | Benjamin Franklin Fischer |
| Actor | Die Himmelhunde von Boragora | Bon Chance Louie | |
| Actor | Macbeth – Der Königsmörder | 1948 | Malcolm |
| Actor | Funny Lady | 1975 | Bobby Moore |
| Actor | Die Mars Chroniken | Father Stone | |
| Actor | Bullwhip Griffin oder Goldrausch in Kalifornien | 1967 | Bullwhip Griffin |
| Actor | Miracle on 34th Street | 1973 | Dr. Sawyer |
| Actor | Das war Roy Bean | 1972 | Frank Gass |
| Actor | Thunderhead - Son of Flicka | 1945 | Ken McLaughlin |
| Actor | Yogi Bär's Abenteuer | 1964 | Bullwinp Griffin |
| Actor | Das zweite Dschungelbuch | 1997 | King Murphy |
| Actor | Mitternachtsspitzen | 1960 | Malcolm |
| Actor | Alice in Wonderland (1985) | The March Hare | |
| Actor | The Big Picture | 1989 | Judge |
| Actor | Fantastic Journey - Gefangen auf der Insel der Zeit | Dr. Jonathan Willoway | |
| Actor | Der Killer-Pavian | 1990 | Sorenson |
| Actor | Carmilla | 1989 | Inspector Amos |
| Actor | Menschenjagd | 1941 | Vaner |
| Actor | The Hollywood Squares | Square Placer (1975) | |
| Actor | Ein Engel auf Probe | 1996 | Saint Peter |
| Actor | Verdammte süße Welt | 1965 | Walter Baines |
| Actor | Mein Freund Flicka | 1943 | Ken McLaughlin |
| Actor | Todfeinde | 1968 | Nick Evers |
| Actor | Schlüssel zum Himmelreich | 1944 | Francis Chisholm, as a boy |
| Actor | That's Entertainment, Part II | 1976 | (archive footage) |
| Actor | Hart aber Herzlich: Tod einer Freundin | 1994 | Jeremy Sennet |
| Actor | Tod im Winter | 1987 | Mr. Murray |
| Actor | Eine nach der anderen | 1971 | Mr. Proffer |
| Actor | Laserkill – Todesstrahlen aus dem All | 1978 | Doctor Mellon |
| Actor | Charlie Chan und der Fluch der Drachenkönigin | 1981 | Gillespie |
| Actor | Cricket on the Hearth | 1967 | Criket Crocket Narrator |
| Actor | Hollywood Wives | Jason Swandle | |
| Actor | Scavenger Hunt | 1979 | Jenkins |
| Actor | Tod in Hollywood | 1965 | D.J.Jr. |
| Actor | Die Grasharfe | 1995 | Amos Legrand |