Robert Stack was an American actor and television host. Known for his deep voice and commanding presence, he appeared in over forty feature films. He starred in the ABC television series The Untouchables (1959–1963), for which he won the 1960 Primetime Emmy Award for Outstanding Performance by an Actor in a Series, and later hosted/narrated the true-crime series Unsolved Mysteries (1987–2002). He was also nominated for an Academy Award for Best Supporting Actor for his role in the film Written on the Wind (1956). Later in his career, Stack was known for his deadpan comedy roles that lampooned his dramatic on-screen persona, most notably as Captain Rex Kramer in Airplane! (1980).

The Untouchables is an American crime drama produced by Desilu Productions that ran from 1959 to 1963 on the ABC television network. Based on the memoir of the same name by Eliot Ness and Oscar Fraley, it fictionalizes the experiences of Ness as a Prohibition agent fighting crime in Chicago in the 1930s with the help of a special team of agents handpicked for their courage, moral character and incorruptibility, nicknamed the Untouchables. The book was later made into a celebrated film in 1987 and a second, less-successful TV series in 1993.