Dark guest starred on two episodes of the ABC religion anthology series, Crossroads, as Irving Green in "The Unholy Trio (1955) and as Frank Corletto in "Circus Priest" (1956).

In 1957 and 1958, Dark guest starred in two episodes of David Janssen's crime drama, Richard Diamond, Private Detective, as the lead in "The Mickey Farmer Case" and then as Rudi Trekhala in "Widow's Walk".

Al Zavala in four episodes of the syndicated crime drama, Code 3, with Richard Travis in the lead role of assistant Sheriff Rodger Barnett.

That same year, Dark played the main villain, William Swanson, in the episode "The Young Gun" in Robert Culp's Western series, Trackdown.

[1] That same year, he was cast as Henri Gaspard in "Double Fee" of Steve McQueen's CBS Western series, Wanted: Dead or Alive.

In 1960, he was cast as Miguel Avarado in the episode "Bandido" of the syndicated Western series, Pony Express, starring Grant Sullivan.

Dark died from a heart attack on October 10, 1971 and was interred in Holy Cross Cemetery, Culver City, California.