After his parents were killed in a Romulan massacre, Worf was raised by humans and became the first Klingon in Starfleet. He was promoted to Chief of Security in TNG's first season, following Tasha Yar's untimely death. Worf later leaves the Enterprise to join Deep Space Nine.

Portrayed By: Michael Dorn

Position/Role: Lieutenant

Affiliation/Role: Chief of Security/Tactical

Race: Klingon

Duration: Seasons 1-7, Movies, DS9