Movies:
* The Three Musketeers (1948) - As Athos
* Fiesta (1947) - As Carlos
* Sombrero (1953) - As Jose
* The Black Castle (1952) - As Don Diego
* The Bridges at Toko-Ri (1954) - As Lieutenant Commander Ramirez
* The Mole People (1956) - As Dr. Jud
* The Fiend Who Walked the West (1958) - As Miguelito
* The Magnificent Seven (1960) - As Calvera
* The Great Escape (1963) - As Hilts (uncredited)
* The Money Trap (1965) - As Mr. Vargas
* The Naked Kiss (1964) - As George Hamilton
* The Wild Angels (1966) - As Padre
* Planet of the Apes (1968) - As Caesar
* The Comic (1969) - As himself
* Beneath the Planet of the Apes (1970) - As Caesar
* The Train Robbers (1973) - As El Fuerte
* The Last of Sheila (1973) - As James
* The Towering Inferno (1974) - As Roger Simmons
* The Sword and the Sorcerer (1982) - As King
* Star Trek II: The Wrath of Khan (1982) - As Khan Noonien Singh
* The Jewel of the Nile (1985) - As Omar
* The Running Man (1987) - As The Chairman
* Convicted (1990) - As Chief Justice
* The Phantom (1996) - As The Ghost Who Walks
Television:
* Fantasy Island (1977-1984) - As Mr. Roarke
* The Love Boat (1977-1986) - Guest appearances
* The Colbys (1985-1987) - As Mirko Deragni
* Knight Rider (1982-1986) - Guest appearances
* Murder, She Wrote (1984-1996) - Guest appearances
* The Golden Girls (1985-1992) - Guest appearances
* Fantasy Island (2021) - Narrator (voice)
This list is not exhaustive but showcases some of his most prominent and beloved roles. He was a versatile actor, known for his charisma, presence, and talent, making him a memorable figure in Hollywood history.