Writer:	Gene L. Coon, Arthur Heinemann
Director:	Jud Taylor
Star:	DeForest Kelley (Dr. Leonard Horatio "Bones" McCoy),  William Shatner (Captain James Tiberius Kirk),  Leonard Nimoy (Mr. Spock)
Recurring Role:	Nichelle Nichols (Lt. Nyota Uhura),  George Takei (Lt. Hikaru Sulu),  Majel Barrett (Nurse Christine Chapel),  Majel Barrett (voice of Computer (uncredited)),  James Doohan (Lt. Cmdr. Montgomery "Scotty" Scott),  Richard Geary (Scalosian #1 (uncredited))
Guest Star:	Jason Evers (Rael),  Kathie Browne (Deela),  Erik Holland (Ekor),  Ed Hice (Scalosian #2 (uncredited)),  Geoffrey Binney (Crewman Compton)

This episode features a rather daring (by 1960s network television anyway) scene of Kirk and Deela that strongly implies that the two had just had sexual intercourse. Kirk is seen sitting on the bed pulling his boots on, while Deela, with a rather pleased look on her face, brushes her disheveled hair in front of a mirror. Some Star Trek internet fans argue that this as one of only two times when it can be pretty much proved that Kirk had sex with a woman on the run of the Original Series. (edit) Features recycled Eminiar VII matte painting from "A Taste Of Armageddon," both in beginning and end of this episode as background. (edit) The story for this episode was written by Gene L. Coon under the pseudonym Lee Cronin. (edit)

Kirk: (to the apparently motionless Lt. Sulu) Lieutenant Sulu (turning to Deela) This is nothing?
Deela: They cannot hear you, Captain. To their ears, you sound like an insect. That's your description, Captain. Accurate, if unflattering. Really there is nothing wrong with them.
Kirk: What have you done?
Deela: Changed you. So you are like me now. Your crew cannot see you or any of us because of the acceleration.
We move in the wink of an eye. Oh, there is a scientific explanation for it, but all that really matters is that you can see me (moving closer to Kirk) and talk to me...and...we can go on from there.
Kirk: Why?
Deela: Because I like you. Didn't you guess? Or are you so accustomed to being kissed by invisible women? (edit) Kirk: (after viewing the dead, prematurely aged crewman Compton) Is this what you have planned for us?
Rael: We all die. Even on Scalos. (edit) Kirk: Am I behaving incorrectly?
Deela: No. It's just that I liked you the way you were before: stubborn, irritating, and independent. (edit) Deela: If I had a suspicious nature, Captain, I would say that you sabotaged the transporter to buy time.
Kirk: Yes of course.
Deela: I'm glad we're both innocent. I despise devious people, don't you?
Kirk: Oh I believe in honest relationships myself. (edit) Kirk: Mr. Spock, my compliments to your repair work and yourself.
Spock: Thank you, Captain. I found it... an accelerating experience. (edit)

The opening scene of the Enterprise's bridge is using stock footage from another episode as it shows Scotty with the slick back hairstyle from an earlier season 3 episode (but is seen with his previous hairstyle throughout the rest of this episode), the rear profile of Chekov instead of another crewman to the right of the viewscreen (even though he didn't actually appear here), and a different woman sitting behind Scotty in place of Uhura who does appear, answering to Kirk at her comm station. (edit) The turbolift door is open before Kirk drinks his coffee and accelerates, even though nobody is near them. (edit) Nichelle Nichols doesn't do a very good job of remaining motionless as William Shatner walks by her. Also, her earrings move in the breeze as he goes by, even though they should be frozen. (edit) When Deela introduces herself, Kirk turns to Spock. Despite the fact everyone is frozen, Spock slowly swivels on his chair, the same as everyone did just before they were frozen. Spock should be completely "frozen" at this point. (edit) Despite they're on a planet where the inhabitants have mysteriously disappeared, and they have no idea what the local environment is like, Compton takes water samples with his bare hands then wipes his mouth with his hands. (edit)

This episode does not have any allusions. Add some now!