While beaming back aboard the Enterprise, a transporter malfunction results in two vastly different Captain Kirks being beamed aboard. His personality has in effect been split into two. One Captain Kirk is weak and indecisive, fearful of making any kind of decision; the other is a mean-spirited and violent man who likes to swill brandy and force himself on female crew members. Meanwhile, as Scotty struggles to repair the transporter, the landing party is stuck on the planet below with temperatures falling rapidly.
Did You Know?
Kirk's alternate green wrap-around uniform was introduced so that the audience would be able to tell the difference between the good Kirk and the evil Kirk. See more
This episode begins with the Captain down on the planet's surface wearing a gold shirt with no insignia. When he beams up to the Enterprise, he is still wearing a gold shirt with no insignia, and his "evil half" also transports in wearing the same: a gold shirt without any insignia. Scotty offers to walk the Captain to his quarters and, miraculously, when we cut to the Captain and Scotty in the corridor, the Captain's shirt has sprouted an insignia as has the evil twin's shirt when he walks into Dr. McCoy's medical bay. See more
Lt. Cmdr. Leonard 'Bones' McCoy, M.D.
Jim, you can't risk your life on a theory!
Being split in two halves is no theory with me, Doctor. I have a human half, you see, as well as an alien half, submerged, constantly at war with each other. Personal experience, Doctor. I survive it because my intelligence wins out over both, makes them live together.
Your intelligence would enable you to survive, as well.
Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more
Theme From Star Trek
Written by Alexander Courage See more