Star Trek: The Animated Series - Season 1

Kirk and crew beam aboard a massive derelict starship from an insect race, and learn that the ship's crew self-destructed rather than carrying a still-living malevolent entity to other worlds.

An expedition through the Guardian of Forever inadvertently prevents Spock from traveling back to his childhood to save his younger self. Spock discovers that history has recorded that he died at age 7 undergoing the Kahs-wan ordeal. Spock travels back to 2237 to save his own life. Spock is successful in restoring the proper timeline; however, this time, his pet sehlat dies during the ordeal.

An enormous space-going cloud entity feeds on the energy of whole planetary systems, and a Federation colony is next in its path. The Enterprise braves its antimatter interior and finds a way to stop it. Spock mind-melds with the entity and tells it that it is killing life, and he persuades it to return to its place of origin.

Investigating a sector of space where starships have disappeared every 27 years, the U.S.S. Enterprise male crew are attracted by a mysterious signal. Kirk beams down with a landing party and encounters a race of beautiful women who survive by drawing the energy from the male members of the ships that they have lured to their planet.

The U.S.S. Enterprise again crosses paths with Cyrano Jones, who this time has tribbles that do not breed but instead grow to an enormous size. The tribbles are back and are causing problems for the Klingons.

Patrolling near the Neutral Zone, the U.S.S. Enterprise finds a ship and rescues Carter Winston, a Federation citizen, financier, and philanthropist missing for 5 years. However, Winston turns out to really be a Vendorian, an alien species that can transform its shape at will. He is also allied with the Romulans.

On the recently-discovered planet Phylos, the U.S.S. Enterprise crew meets Dr. Keniclius, a human scientist who survived Earth's Eugenics Wars and now grown to giant proportions. The Phylosians are a once vast plant-based civilization that has been reduced to a few survivors. Led by Keniclius, the Phylosians abduct Spock so the doctor can make him into a giant clone with the intention of forcing peace on the galaxy.

The Enterprise travels to the center of the galaxy only to discover themselves sucked into a dimension where the laws of time and space no longer apply, and "magic" functions for those capable of grasping its fundamentals. Stopping at Megas-Tu, a planet where magic and witchcraft are the norm, the crew finds their guide is Lucien, who is Lucifer of Earth mythology.

The Enterprise travels to the shore leave planet for some well-deserved rest and relaxation. The planet can create organic androids based on the crew's imagination, but they soon discover that the planet has a hostile mind of its own. The "amusement park" planet's keeper is now dead and the untended machinery is constructing dangerous images from the crew members' thoughts.

Harry Fenton Mudd is once again apprehended and incarcerated by the U.S.S. Enterprise crew, after trying to sell love crystals. He claims the love potion can cause any male and female to fall in love. He inadvertently releases it into the Enterprise's ventilation system and they discover that his claims are true. Mudd abducts Nurse Chapel and briefly escapes to a rocky planet in a stolen Enterprise Heavy shuttlecraft, but he is recaptured and sentenced to an indefinite period in rehabilitation therapy for violations of the Federation pharmaceutical code, including fraud, illegal drug manufacturing, swindling, and transport of a dangerous life-form (a Rigellian hypnoid).

While exploring a burnt-out supernova, the U.S.S. Enterprise responds to an old-style distress signal containing the word "Terratin," and follow it to its source: an uninhabited planet about to shatter from internal stress. However, a mysterious beam strikes the ship and the crew begins to shrink... and shrink... On the planet, Kirk finds a miniature city called Terratin and soon discovers that it is a lost Earth colony that has mutated because of the supernova's radiation.

The U.S.S.Enterprise is sent on a mission to explore a "Bermuda Triangle of Space," only to find itself and a Klingon battlecruiser trapped in a time warp after being caught in an ion storm. The two ships must cooperate before their only exit back to real space closes for good. This Delta Triangle is inhabited by other lost ships, many centuries old.

While exploring the aquatic planet Argo, Kirk and Spock are lost at sea. They are later found... but have been transformed into water breathers. Now they must track down the planet's mysterious undersea inhabitants and find a cure, or be left to live as freaks in the Federation. The venom of a deadly sea snake is the only antidote to return them to their normal selves.

Spock, Sulu, and Uhura are delivering a stasis box from the extinct Slaver race on the shuttlecraft Copernicus. When they detect another box and follow its signal, they soon discover that a Kzinti privateer has set a trap. Capturing the Enterprise crew, they discover their box holds a rare find, a shape-shifting Slaver weapon. Now Spock and the others must keep the Kzinti from returning to their government with the weapon.

Beaming down to a planet to search for the crew of the missing ship Ariel, the U.S.S. Enterprise crew is captured by a race of super-intelligent slug creatures and become part of a zoo collection. They find the missing crew also trapped as prisoners in the alien zoo. Now they must somehow establish communications with their evolved slug-like captors who think of them as primitive animals.

Kirk and Spock are chosen by a mysterious race to join an expedition of alien specialists to a "mad planet" and recover a missing artifact, the Soul of Alar, before the avian Skorr go on a galactic jihad.