While responding to a distress call from the science team exploring the planet Camus II, Captain Kirk comes face-to-face with Dr. Janice Lester, a scorned woman from his past. Using a transference device she discovered on the planet, Lester traps Kirk, switches bodies with him and proceeds to impersonate him in her calculated efforts to take over the Enterprise. The ruse works for a little while, until the Enterprise crew becomes concerned about Kirk's erratic behavior since returning from the planet. Meanwhile, the real Kirk has to convince Mr. Spock that he's the real deal while he is trapped inside Janice Lester's body, and he must do so before Lester (in Kirk's body) kills his life force and completes the transference once and for all. The notorious "Turnabout Intruder" was hardly the episode that "Star Trek" deserved to close out its otherwise stellar three-year run, but as flawed and dated as it is, it also features one of William Shatner's finest performances in the entire series. Despite coming down with the flu, Shatner pulled out all the stops and really sold it with a go-for-broke performance, and that alone makes "Turnabout Intruder" far more entertaining than it probably deserves to be.

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