ST:TNG:68 - "Tin Man" (Stardate: 43779.3) - this is the 20th episode of the 3rd season of Star Trek: The Next Generation.
The Enterprise picks up a passenger, a Betazoid telepath Tam Elbrun (who was a patient of Troi's while she was studying on Betazed), who will be the chief Federation specialist with a new alien intelligence named Tin Man. And they must get to Tin Man before the Romulans do . . . and everything rests on Tam Elbrun's shoulders, who is revealed to be mentally unstable and with a trick up his sleeve.
Trivia note: the Hood, Riker's previous ship he served on, drops off a passenger (you even get to see the captain of that ship, Captain DeSoto). Also, Tam's nickname for Troi is "D". And, Data reveals, although he has tried it from time to time, he doesn't need sleep.
The Enterprise picks up a passenger, a Betazoid telepath Tam Elbrun (who was a patient of Troi's while she was studying on Betazed), who will be the chief Federation specialist with a new alien intelligence named Tin Man. And they must get to Tin Man before the Romulans do . . . and everything rests on Tam Elbrun's shoulders, who is revealed to be mentally unstable and with a trick up his sleeve.
Trivia note: the Hood, Riker's previous ship he served on, drops off a passenger (you even get to see the captain of that ship, Captain DeSoto). Also, Tam's nickname for Troi is "D". And, Data reveals, although he has tried it from time to time, he doesn't need sleep.