Peter Mamakos best known for playing Greek, Indian, Hispanic, French, Italian and Middle Eastern villains from 1930s up until the 1990s. He had a recurring role as Jean Liffite on the ABC western The Adventures of Jim Bowie. He also appeared as a Lionian Henchman in Tarzan and the Slave Girl starring Lex Barker. Mamakos made three guest appearances on Perry Mason from 1962–66, including the role of killer Nick Paolo in the 1962 episode, "The Case of the Stand-in Sister," and murder victim Olaf Deering in the 1966 episode, "The Case of the Sausalito Sunrise." He also appeared in 1966 in episodes 41 and 42 of Batman. He appeared in several episodes of the TV Show, The Lone Ranger.
Mamakos is also remembered as Happy J. King, the Metropolis crime boss who engaged a European criminal scientist to invent "synthetic kryptonite". Kidnapping Lois Lane and Jimmy Olsen, King came closer than any other criminal in ridding the Earth of Superman (George Reeves). This event was recounted in "The Defeat of Superman," the sixth episode of the second season of The Adventures of Superman which first aired on October 24, 1953. He co-starred on Daniel Boone in 1970 as a Cherokee Chief in episode 18 "A Run for the Money."