Austrian-born actor and folk singer (1924–2015) who played Sergey Rozhenko, Worf's talkative human adoptive father and a retired Starfleet chief petty officer, in the Next Generation episode Family.
Theodore Bikel was an actor, singer and musician with a long career on stage and screen. He created the role of Captain von Trapp in the original Broadway production of The Sound of Music, played Tevye in Fiddler on the Roof many times and earned an Academy Award nomination for The Defiant Ones.
His single Star Trek role came in Family, in which Sergey and Helena Rozhenko beam up to the Enterprise-D at Earth Station McKinley to see their adopted son after his discommendation. Sergey, a former warp-field specialist, is delighted by the ship and embarrasses Worf by wanting a tour of everything.
Bikel plays him as warm and garrulous, and the closing scene in which the couple assure Worf of their support is one of the episode's quiet high points.