While visiting an old friend, Kirk suspects a Shakespearean actor may actually be the murderous former governor of Tarsus IV where Kirk grew up. Kirk invites the acting troupe aboard the Enterprise in order to investigate, but soon assassination attempts are made

Spock and a scientific party are sent to study the Murasaki 312 Quasar aboard the shuttle Galileo. During the survey, the Galileo is forced to make an emergency landing on the planet Taurus II, where the crew fight the planet’s dangerous inhabitants. As the

Captain Kirk is placed on trial for negligence after a crewman is killed during a severe ion storm. Kirk maintains that his actions were proper and should not have led to the officer’s death, but the evidence seems strong against

Spock hijacks the Enterprise to take his crippled former captain, Christopher Pike, to the forbidden world of Talos IV . He then demands a court martial where he uses the events of “The Cage” to tell the tale of Pike’s captivity on the

Captain Kirk orders shore leave for the Enterprise crew on a seemingly uninhabited planet in the Omicron Delta system. The landing parties begin to see strange sights, such as a white rabbit a la Alice in Wonderland, Don Juan, and a sword-wielding Samauri. Also,

The Enterprise discovers a rogue planet drifting through space, inhabited by an eccentric being named Trelane who uses his apparently unlimited power over matter and form to manipulate the crew.

The Enterprise comes under attack by unknown aliens while investigating the near destruction of the Cestus III colony. While chasing the aliens into unexplored space, both ships are captured by the powerful Metrons, who force Kirk and the alien captain (later identified

While orbiting an apparently dead planet, the Enterprise seems to experience a strange moment of “nonexistence”. Captain Kirk discovers a man named Lazarus on the planet below, who claims the effect was caused by his “enemy”, later revealed to be an insane

After accidentally traveling back in time to 1969, the Enterprise rescues USAF Captain John Christopher from his crippled fighter jet. The crew struggles to return to their own time, while simultaneously returning Christopher to the Air Force, removing his knowledge of the future

The Enterprise discovers a planetary population controlled by a powerful being called Landru. While investigating, Captain Kirk and his landing party are taken captive and discover that the Enterprisecrew will be the next to be “absorbed” into Landru’s control

On Eminiar VII, the Enterprise finds a civilization at war with its planetary neighbor. Unable to discern any signs of battle from orbit, Captain Kirk leads a landing party to the surface where he discovers the entire war is fought by computer.

The Enterprise discovers an ancient Sleeper Ship, the SS Botany Bay, which escaped from Earth’s Eugenics Wars in the late 20th century. The geneticallyengineered passengers, led by war criminal Khan Noonian Singh, seize control of the Enterprise and attempt to destroy the ship. (This episode serves as the