| "Spock's Brain" | |
|---|---|
| Star Trek: The Original Series episode | |
 On Kirk's command, Spock grabs Kara's wrist to deactivate her bracelet. | |
| Episode no. | Season 3 Episode 1 |
| Directed by | Marc Daniels |
| Written by | Lee Cronin |
| Featured music | Fred Steiner |
| Cinematography by | Jerry Finnerman |
| Production code | 061 |
| Original air date | September 20, 1968 |
| Guest appearances | |
| |
"Spock's Brain" is the third season premiere episode of the American science fiction television series Star Trek. Written by Gene L. Coon (under the pseudonym Lee Cronin) and directed by Marc Daniels, it was first broadcast on September 20, 1968.
During the episode, an alien female played by Marj Dusay beams aboard the Enterprise and, after incapacitating the rest of the crew, surgically removes Spock's brain. Captain Kirk and the crew have just hours to locate and restore it before Spock's body dies.
Widely regarded as the worst episode of the series, it was the first to air after NBC moved the show from 8:30 p.m. to 10 p.m. on Friday nights.