Worf, played by Michael Dorn, is a main charater in Star Trek: The Next Generation and in seasons four to seven of Star Trek: Deep Space Nine also appears in the films based on The Next Generation. Worf is the first Klingon main character to appear in Star Trek.

Worf was born in 2340 on the Klingon homeworld as the son of Mogh. Five years later, his parents moved to the Khitomer colony. Worf's parents were killed during a surprise attack by the Romulans on the Khitomer outpost. The colony's distress call was answered by the Federation starship USS Intrepid. Chief Petty Officer Sergey Rozhenko found Worf in the rubble and took him in after failing to find any living relatives. Rozhenko and his wife Helena raised him on a small farm colony on the planet Gault, a world of about 20,000 inhabitants, almost all of them human. Worf also has a human brother, Nikolai, through his adoption by the Rozhenkos, with whom he often quarreled. He also spent time in his parents' native Minsk later recommending it to O'Brien as one of his favorite places on Earth.

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