Trivia: Banned in Germany until mid 1990.
Trivia: Stock footage of the White Rabbit's footprints from "Shore Leave" were used for the mugato footprints.
Trivia: This was the first time in the original series that Captain Kirk does not appear on board the Enterprise at any point.
Trivia: All the footage of the shuttlecraft in outer space was reused from Star Trek: The Galileo Seven.
Trivia: Nancy Crater's scream from "The Man Trap" is reused as Kara's scream when she is killed.
The Trouble With Tribbles - S2-E15
Trivia: This is the first time in the series the Klingon language is mentioned.
A Piece of the Action - S2-E17
Trivia: This is the only episode that ends with a freeze-frame.
A Piece of the Action - S2-E17
Trivia: James Doohan provided the voice of the radio announcer.
Trivia: Neither Nichelle Nichols nor Walter Koenig appear in this episode.
Trivia: When Kirk is donning the Gestapo uniform, Spock says, "You should make a very convincing Nazi." Although the look Kirk gives him is funny, it should be remembered that both William Shatner and Leonard Nimoy were both Jewish.
Trivia: The events and description of the Planet Killer in this episode are referenced in The Next Generation novel "Vendetta." It was in the records Data was examining for a report for Picard. The first one was called a prototype, and the one Picard and crew face is the finished model. Larger, more powerful, and warp capable, this machine was driven by the vendetta of a person that wants revenge on the Borg.
Where No Man Has Gone Before - S1-E4
Trivia: As the Enterprise encounters the field, Gary Mitchell is affected, and his eyes glow with an unknown, alien force. In the Star Trek The Next Generation novel "Q Squared", Q engages Trelane in a fight and is blasted backwards into the past, into a formless mass of energy. When the Enterprise encounters the energy at the edge of the galaxy, Q enters into Mitchel, giving him the power of Q.
Trivia: This episode (which first aired on October 27, 1967) was the only "holiday-themed" episode of Star Trek TOS. It was supposed to be a Halloween-ish story with witches, a spooky castle, black cats, skeletons and zombies, and there are repeated references to Halloween and "Trick-or-Treat" throughout the episode.
Trivia: Before being cast as Dr. McCoy, DeForest Kelley was offered the role of Mr. Spock.
The Ultimate Computer - S2-E24
Trivia: In this episode, when brooding about M5, Kirk quotes John Masefield, "All I ask is a tall ship, and a star to steer her by." In Star Trek V, on approach to the Enterprise-A, he again uses the quote.
Answer: Kirk was getting his physical and Dr. McCoy probably turned off communications, because if he hadn't, Kirk would have left and headed straight for the bridge, leaving McCoy irritated.