Turnabout Intruder (Episode 79) - The U.S.S. Enterprise receives a distress call from Camus II, where they find all but two inhabitants dead from radiation. One survivor, Janice Lester, is an old friend of Kirk's. But now she despises him and uses an alien technique to exchange bodies with him. When Kirk/Janice tries to explain things, Spock, Scotty and McCoy are accused of mutiny and Janice/Kirk calls for the death penalty!
"Turnabout Intruder" was the original series' final episode.
The Cage (Episode 99 & 1) - The two versions of Star Trek's rarely aired pilot star Jeffrey Hunter as captain of the U.S.S. Enterprise. On an earlier voyage of the U.S.S. Enterprise, Kirk's predecessor Captain Christopher Pike tries to rescue an Earth crew that disappeared eighteen years earlier. But it's a trap! Pike is imprisoned in a zoo-like cage and studied by a mysterious higher life-form.
"The Cage (Episode 99) was reconstructed with black and white footage from Gene Roddenberry's work print and color footage from "The Menagerie" (Episode 16). "The Cage" (Episode 1) includes the long-lost color footage (believed to have been destroyed) from Gene Roddenberry's pilot episode.
Original broadcast preview trailers
"Star Trek: The Next Generation" season one trailer.