Sergey Rozhenko
Sergey Rozhenko was a retired Starfleet chief petty officer and warp field specialist formerly assigned to the Excelsior-class, USS Intrepid under Captain Drew Deighan. Rozhenko was married to Helena Rozhenko and had one son, Nikolai Rozhenko. (TNG: "Heart of Glory", "Family", "Homeward")
Sergey served aboard the USS Intrepid, in 2346, when the ship answered a Klingon distress call following the Romulan attack on the Khitomer outpost. In the wreckage of the outpost, Sergey discovered a young Klingon, named Worf. Through an act of kindness, Sergey and Helena together fostered Worf. (TNG: "Heart of Glory", "Sins of the Father")
In 2347, the Rozhenko family was residing on the farming colony of Gault where Worf and Nikolai grew up. (TNG: "Heart of Glory", DS9: "Let He Who Is Without Sin...")
After some time, they would return to Earth where Worf would eventually leave his family to attend Starfleet Academy. The Rozhenko's would continue to live out their retirement in the same dwelling for a number of years to follow. (TNG: "New Ground")
Sergey had a fascination with starships, which was expressed in his collection of all the specs and diagrams of the Galaxy-class starships. (TNG: "Family")
In 2367, the Rozhenko's visited the USS Enterprise-D while it was docked at Earth Station McKinley following its encounter with the Borg. They transported aboard from Earth Station Bobruisk. During their visit, they received a full tour of the Enterprise-D, and later both parents would share their concern and show their support for Worf's recent discommendation. (TNG: "Family")
Later that year, Sergey and Helena would meet the Enterprise-D at Starbase 73 to take their grandson, Alexander Rozhenko, back to Earth to provide him with a home and a family, following the death of K'Ehleyr, something Worf would not provide on his own. (TNG: "Reunion")
By 2374, Alexander had decided to join the Klingon Defense Force. Sergey and Helena were not happy about the decision, but when they realized Alexander was determined to enlist, they supported him as they always had. (DS9: "Sons and Daughters")
- Sergey Rozhenko, played by Theodore Bikel, appeared only in the episode TNG: "Family".