Synopsis for
"Star Trek" By Any Other Name (1968)

The Enterprise answers a distress call to a verdant planet, only to be met by a group of aliens, called Kelvins, who have adopted human form. They immediately imprison Kirk and the landing party and commandeer the ship, which they need in order to return to their home planet in the neighboring Andromeda Galaxy, as their ship had been damaged in an attempt to penetrate an energy barrier between the galaxies. They keep the humans in line by use of a device on their belts that paralyzes them. While imprisoned on the planet, Spock fails and is slightly injured in a mind meld attempt with the female alien (Kelinda). As punishment, the aliens shrink two "non-essential" personnel down to their essence: small, crumbly blocks, one of which the Kelvin leader, Rodan, crushes, and the other he restores to life. But Spock did succeed in gaining a glimpse of the aliens' original form - huge, multi-tentacled creatures, who must adopt human form in order to physically fit aboard the Enterprise. With all back aboard, the crew realizes that the energy source from which the aliens employ their weapons is protected by an impenetrable material. With the situation seemingly hopeless, and the Kelvins gunning the Enterprise's engines beyond their capacity toward the teeth of the barrier, Spock and Scott inform Kirk that, upon his order, they will blow up the ship, but Kirk can't bring himself to do it. Once through the barrier, the entire crew, except for Kirk, Spock, McCoy and Scott are reduced to blocks. Spock notices one of the aliens savoring human food and deduces that in the process of converting to human form, the Kelvins may be vulnerable to human weaknesses. Each of the four go about exploiting these soft spots in his own special way: Scott sacrifices his cherished bottle of vintage scotch to get one drunk, McCoy makes one extremely irritable through injections. But the most critical is the tag team approach of Kirk's seduction of the beautiful Kelinda and Spock's arousing of Rodan's jealousy. Rodan confronts the kissing Kirk and Kelinda. Kirk, through words and slaps, goads Rodan into fighting. Employing numerous submission holds as a means to get Rodan to listen to reason, Kirk convinces him that for the Kelvins, there's no going back, that they now are truly human. On behalf of the Federation, Kirk offers them a chance to inhabit the same verdant planet back in the Milky Way Galaxy.