Investigations (Star Trek: Voyager)

"Investigations" is the 154th episode of the science fiction television series Star Trek: Voyager, the 30th episode of the seventh and final season. It first aired on UPN on May 9, 2001.

The episode focuses on a disillusioned Tuvok, who abruptly leaves Voyager without explanation, joining a group of renegade Maquis. Captain Janeway, suspicious of Tuvok's motives and sudden departure, initiates an investigation to uncover the true reasons behind his actions.

As the crew delves deeper, they uncover a complex conspiracy involving a secret Cardassian weapon and a covert operation being conducted by Tuvok within the Maquis cell. The episode explores themes of loyalty, deception, and the lengths one will go to in the name of duty. Janeway grapples with the possibility that Tuvok has genuinely defected, while Chakotay's Maquis background provides a unique perspective on Tuvok's potential motivations. The investigation reveals Tuvok's sacrifice and commitment to Starfleet ideals, even when operating undercover in dangerous and morally ambiguous situations. The episode culminates in Voyager's intervention to prevent the Cardassian weapon from falling into the wrong hands and the return of Tuvok to the crew, his loyalty ultimately proven.