Spock’s Brain
The episode called “Spock’s Brain” was ranked as one of the worst TOS episodes because of all the clichés and the implausible plot. The phrase “Spock’s Brain” later became a cultural term that refers to an unintentionally humorous episode.
Source: Cygnus-x1.net
Speaking of Spock, when he sacrificed his own life to save the Enterprise from Kahn’s destruction in the film ‘The Wrath of Khan,’ Kirk could only say, “Of all the souls I have encountered in my travels, his was the most . . . human.”