arrives at Camus II in response to a distress call from a research team led by Dr. Janice Lester. Kirk, Spock and McCoy beam down and find Lester and the expedition’s doctor, Arthur Coleman. Lester is suffering from what appears to be radiation exposure. Kirk knows her from their time together at Starfleet Academy, and offers to stay with her to calm her down while the others go to examine the other members of the team. Once they’re gone, Lester seemingly recovers consciousness and talks about how she felt betrayed by him, and that there was no place for women among starship captains. Unwilling to get into their old differences, Kirk goes over to a nearby wall with alien mechanisms, and Lester triggers a remote paralyzing him. She then gets up and stands next to him and activates the alien device. A glow of energy surrounds them and each one’s mental essence is transferred into the others’ body...Read the full recap
Leonard Nimoy (Spock) is the only actor to appear in all 79 episodes of the series. In second place is William Shatner (Captain Kirk), who appeared in every episode except for "The Cage
This episode was originally due to be aired on March 28, 1969. However, it was re-scheduled following the death of former President Dwight D. Eisenhower on that same date.
Leonard Nimoy (Spock) and Majel Barrett (Number One/Nurse Chapel) are the only actors to appear in both this episode and the first pilot, "The Cage
Besides William Shatner, Sandra Smith is the only other credited actor to ever play Captain James T. Kirk until the 2009 movie.
DeForest Kelley (Dr. McCoy) died thirty years and eight days after this episode originally aired.
The last line of the series, "Her life could have been as rich as any woman's. If only...if only" was delivered by William Shatner (Captain Kirk).
Nichelle Nichols doesn't appear in this episode as she had a singing engagement.
Majel Barrett has brunette hair for the first and last time.
Dr. Janice Lester: The year we were together at Starfleet is the only time in my life I was alive.
Kirk: I never stopped you from going on with your space work.
Dr. Janice Lester: Your world of starship captains doesn't admit women. It isn't fair.
Kirk: No, it isn't. And you punished and tortured me because of it.
Dr. Janice Lester: I loved you. We could've roamed among the stars.
Kirk: We'd have killed each other.
Dr. Janice Lester: It might have been better.
Lester-Kirk: Believe me, it's better to be dead. than to live alone in the body of a woman. It's better to be dead...
Lester-Kirk: Well, this is especially disturbing to me for... uh, personal reasons.
McCoy: Oh? I didn't know you knew her that well.
Lester-Kirk: Oh, yes. Been a long time since I saw her. I walked out on her when it became serious.
McCoy: Well, you must have been very young at the time, Jim.
Lester-Kirk: Youth doesn't excuse everything, Dr. McCoy.
Spock: How is the doctor?
Guard: She regained consciousness quickly.
Spock: Good. I have questions to ask her.
Guard: Did the captain order it?
Spock: Why should he? They are my questions, therefore I am ordering it, Lieutenant.
Spock: You've had great deal of evidence, except that of the chief witness. The one who should be the real subject of this investigation is kept locked away and in isolation. Why, Captain?
Lester-Kirk: She's dangerously insane. We've seen the evidence.
Spock: She is dangerous only to your authority, sir.
Lester-Kirk: You, uh, claim that, uh... that you are Captain James T. Kirk?
Kirk-Lester: No. I am not Captain Kirk. That is very apparent. I claim that whatever it is that makes James Kirk a living being special to himself is being held here in this body.
Lester-Kirk: Oh. Well... however, a-a-a-as I understand it, I... am Dr. Janice Lester.
Kirk-Lester: That's very clever, but I didn't say it. I said, the body of James Kirk is being used by Dr. Janice Lester.
Lester-Kirk: Mm-hmm. A subtlety that somehow escapes me.
Lester-Kirk: Spock. Spock, give it up! Return to the Enterprise family. All charges will be dropped and the madness that temporarily overcame all of us on Camus II will fade and be forgotten.
Scotty: Doctor, I've seen the captain feverish, sick, drunk, delirious, terrified, overjoyed, boiling mad. But up to now, I have never seen him red-faced with hysteria. I know how I'm going to vote.
McCoy: I've been through this with Spock. He's not being scientific and neither are you.
Scotty: It may not be scientific, but if Mr. Spock thinks it happened, then it must be logical.
McCoy: Don't you think I know that? My tests show there's nothing wrong with the captain. That's the only fact Starfleet's going to be interested in.
Scotty: Headquarters has its problems, and we have ours. And right now, the captain of the Enterprise is our problem.
Kirk: I didn't want to destroy her.
Spock: I'm sure we all understand that, Captain.
Kirk: Her life could have been as rich as any woman's. If only... if only...
Spock tells Captain Kirk (in Dr. Lester's body) that he has never heard of complete life energy transfer being achieved successfully anywhere in the galaxy. However, he himself underwent the process when he exchanged minds with Henoch in "Return to Tomorrow
Despite his death in "The Omega Glory
", Lt. Galloway (David L. Ross) returns without explanation in this episode.
As is common throughout the third season, Chekov is seen on the bridge at Navigation. However, when Lester/Kirk orders Chekov to plot a course to Benecia III, the director recycles earlier footage of of the bridge from behind Kirk with Blackburn is at navigation. In the next shot, Chekov is back at the position.