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Commander Deanna Troi is a fictional character in the Star Trek universe, played by the actress Marina Sirtis in the series Star Trek: The Next Generation and Star Trek: Voyager (the latter only in guest appearances), and in several Star Trek films. According to the novel Imzadi, Troi became interested in Starfleet as a career after a romantic involvement with William Riker. However, it is debatable whether this novel is canon.
Troi was ship's counselor on the USS Enterprise-D (NCC-1701-D) and also subsequently on the USS Enterprise-E (NCC-1701-E).
She was born on March 29, 2336 near Lake El-Nar, Betazed, to parents Betazoid Ambassador Lwaxana Troi (a Betazoid) and the late Starfleet Lt. Ian Andrew Troi (a human). Troi, though lacking in her range of mental abilities due to her half-human heritage, is capable of extra-sensory empathy, which often comes in useful when dealing with hostile aliens, though often she fails to detect intelligence in creatures with a brain structure dissimilar from that of the standard humanoid until it's too late.
In 2364, she joined as a lieutenant commander on the Enterprise-D and in 2370 was promoted to commander.
In 2372, following her crash-landing of the Enterprise-D, she was transferred to the Enterprise-E.
In 2379, after an on-again/off-again relationship which solidified in Star Trek: Insurrection, Deanna Troi married Commander William Riker and transferred to the USS Titan with her husband, who was promoted to captain and assumed command of the vessel. (Events depicted in Star Trek: Nemesis)
