The complexity of Star Trek 's production had steadily increased the show's production time, leading to concerns that Desilu Productions wouldn't be able to deliver episodes to NBC in time to meet their series commitments. "The Menagerie" was created as a means to reuse footage from " The Cage " — the then-unaired 1965 pilot episode of Star Trek — within a frame story as the early history of the starship Enterprise . As such, the two-part episode only required a week of production time.

Part I Edit

On stardate 3012.4, the Federation starship USS Enterprise arrives at Starbase 11 in response to a subspace call First Officer Spock (Leonard Nimoy) reported receiving from the former captain of the Enterprise, Christopher Pike (Sean Kenney), under whom Spock had served. Captain Kirk (William Shatner) and Spock meet the starbase commander, Commodore Mendez (Malachi Throne). Mendez doubts that Pike had sent the message, given that Pike was in a severe burn accident and is confined to a wheelchair for the rest of his life, unable to communicate save through answering yes/no questions with the aid of a device operated by his brainwaves. Pike refuses to communicate with anyone except Spock, and Kirk and Mendez leave to discuss the situation. Once they are gone, Spock informs Pike he will be taking him regardless of Starfleet's orders. Spock overwhelms Pike's guards and takes him aboard the Enterprise, and through a series of deceptions, convinces the crew to set a new course on Starfleet's orders.

Meanwhile, Mendez and Kirk are concerned with Spock's behavior and find that there was no record of Spock receiving any message. Mendez provides Kirk with classified information on the planet Talos IV, which was visited by the Enterprise previously under Pike's command, and is now under a strict "no contact" Starfleet regulation. They are made aware of the departure of the Enterprise, and the two give chase in a Starbase shuttlecraft.[1] When Spock learns of this, he has them brought aboard and then gives himself up, confessing to committing mutiny. The crew finds they are unable to stop the current course of the Enterprise, which Spock affirms is heading towards Talos IV. Mendez demands a preliminary hearing be held, which requires three command officers. Kirk objects that only he and Mendez are present, but Spock notes that Pike also is a command officer still listed for active duty. The tribunal begins, and Spock offers as his testimony video footage of the Enterprise's earlier visit to Talos IV.[note 1]

In the original mission, the Enterprise traveled to Talos IV in response to a distress call from the survey ship Columbia, lost 18 years previously. Pike (Jeffrey Hunter), Spock and a landing party beam down to the planet. They find a number of survivors including a young woman named Vina (Susan Oliver), who was born shortly after the crash of Columbia. Dr. Boyce (John Hoyt), Pike's chief medical officer, establishes that the survivors are all in perfect health, extremely puzzling given the primitive living conditions they should have endured for so many years. Pike is lured away from the rest of the team by Vina, who promises to show him a secret that explains the survivors' health. When they reach a rocky knoll, a hidden door opens. Two aliens emerge, stun Pike, and carry him through the door, which closes. The remaining survivors and their camp suddenly disappear. Pike has been abducted by the Talosians, humanoid aliens who have been monitoring his crew. They are telepaths with the power to create illusions indistinguishable from reality, and the Columbia survivors and their camp were one such they created to trap Pike.

In the present, Kirk learns that the video source that Spock has been showing is not from data archives, but instead is being broadcast to them from Talos IV. Starfleet has also learned of the intended destination of the Enterprise, and Mendez orders Kirk to stand down as the captain is responsible for all members of his crew. Kirk demands Spock end the transmission, but Spock respectfully refuses, and the episode ends as Spock is sent to be locked up and the tribunal ends in recess.

Part II Edit

The tribunal of Spock continues despite Starfleet's orders to end the Talos IV transmissions. The footage continues from before, where Pike has been caged with Vina. The Talosians want the two to mate to produce offspring and allow the Talosians to rebuild their civilization, which fell after they discovered the ability to cast the illusions. The aliens put the two through numerous virtual realities, hoping to give Pike some mild interest in Vina to copulate. Pike refuses, and does not relent when the Talosians project more horrific images to him. Meanwhile, the Enterprise crew finds the cave entrance where Pike disappeared, but are unable to break it open even when using direct attacks from the ship's weapons. They attempt to beam a landing party into the cave, but the Talosians detect this and manipulate the beam to allow only the female crew members to beam down, in order to offer Pike more choices for a mate. The new captives have phasers, and they attempt to shoot out a portion of the cell wall but find this ineffective.

That night, Pike is able to capture a Talosian as the being tries to confiscate the phasers. Pike intuits that the phasers still function, and that their earlier attempt at escape was masked by an illusion. He forces the Talosian to reveal the hole they had previously made. The group then escapes to the surface, but learns that this was allowed by the Talosians, in hopes the humans would become a slave colony on the planet's surface. Number One (Majel Barrett, billed as M. Leigh Hudec) attempts to set her phaser on overload, preferring to die rather than be enslaved, but she is persuaded to deactivate the weapon when more Talosians arrive after having scanned the Enterprise databanks. The aliens have learned that humans have a hatred of captivity and agree to let the crew go. Pike is upset that the Talosians do not even apologize for holding them, but the head Talosian, the Keeper, explains that they are now resigned to the end of their civilization. Pike offers help from the Federation, but the Talosians refuse, fearing that the Federation would learn of the illusion powers and fall like their own civilization. Agreeing to leave the Talosians in peace, all but Pike are beamed back to the ship. Pike is shown that Vina's looks have been an illusion all along, having suffered great injury on the crash of the Columbia, but has been restored to relative health and is at peace with the help of the Talosians. Pike returns to the ship, assured that Vina will be well looked after.

The transmission ends at the tribunal just as the ship is arriving at Talos IV. Kirk now knows what Spock's plans have been, as the Talosians would be able to offer Pike the same treatment as Vina. The court-martial is revealed as a diversionary tactic by the Talosians when Commodore Mendez suddenly fades away, having been an illusion both on the Enterprise and in the shuttlecraft. The Keeper then appears on the viewing screen, telling Kirk that Spock had related to them Kirk's strength of will and that the fiction of a court-martial was to delay Kirk from too soon regaining control of the Enterprise before it reached Talos IV. A message from Commodore Mendez then advises that Starfleet also was witnessing the same imagery itself, and officially waives the prohibition against the planet for this one occasion in recognition of Capt. Pike's service. Spock is cleared of all charges, and he tells Kirk he did not explain his actions to prevent Kirk from becoming an accessory to the crime. Pike is transported to the planet where he is met by Vina and the Talosians. While broadcasting to the Enterprise, the rejuvenated Pike and Vina are shown returning with the Talosians to their cave. Kirk observes this on the viewing screen and the Keeper appears one last time to wish Kirk well. The Enterprise returns to Starfleet.