Star Trek: Voyager 170: Renaissance Man (2001)

Synopsis
Commander Chakotay (Robert Beltran) is unpleasantly surprised when Captain Janeway (Kate Mulgrew) evinces a willingness to hand over important Voyager technology to the untrustworthy R'Kaal Collective. She explains that, after years of attempting to return to Earth, she no longer wants to endanger the lives of her crew, and thus sees no need to hold on to the precious technology. Though the Doctor (Robert Picardo) insists that, according to her last checkup, Janeway is still mentally sound, Chakotay begins to suspect that the Captain isn't quite "herself" -- and he's right! The highlight of this penultimate Star Trek: Voyager adventure is the Doctor's surprising gift for mimicry. "Renaissance Man" first aired on May 16, 2001. ~ Hal Erickson, All Movie Guide