American actor and acting teacher (1914–2002) who played Plasus, High Advisor of the cloud city Stratos, in the third-season Original Series episode The Cloud Minders.
Jeff Corey was an American actor, born in 1914, whose films include Butch Cassidy and the Sundance Kid (1969), True Grit (1969) and Little Big Man (1970). Blacklisted in the 1950s, he became one of Hollywood's most influential acting teachers; Leonard Nimoy was among those who studied with him.
In The Cloud Minders he played Plasus, ruler of the planet Ardana, who lives with his daughter Droxine in the floating city while the Troglytes mine zenite below. Plasus refuses to believe that mine gas stunts the miners' minds, until Kirk traps him in a mine with the rebel Vanna and lets the gas work on them both.
Corey also directed episodes of television. He died in 2002.