Star Trek: The Animated Series: Season 2 (1974)
- Season 2 Episode 6: The Counter-Clock Incident
The crew is dragged into a universe where time runs backwards.
- Season 2 Episode 5: How Sharper Than a Serpent's Tooth
The Enterprise encounters an alien who visited Earth centuries ago.
- Season 2 Episode 4: Albatross
Authorities arrest Dr. McCoy for an event that took place 19 years before.
- Season 2 Episode 3: The Practical Joker
A playful alien-being possesses the Enterprise.
- Season 2 Episode 2: Bem
An observer bothers Kirk and Spock while they are on a planetary scouting mission.
- Season 2 Episode 1: The Pirates of Orion
Aliens attack a ship that is carrying the cure for Mr. Spock's fatal disease.
Star Trek: The Animated Series: Season 1 (1973 - 1974)
- Season 1 Episode 16: The Jihad
Kirk leads a group trying to recover a stolen religious relic.
- Season 1 Episode 15: The Eye of the Beholder
Telepathic aliens put Kirk, Spock and McCoy in a zoo.
- Season 1 Episode 14: The Slaver Weapon
Spock, Sulu and Uhura are taken captive.
- Season 1 Episode 13: The Ambergris Element
Kirk and Spock transform while exploring the planet Argo.
- Season 1 Episode 12: The Time Trap
The Enterprise crew must work with Klingons to escape from a pocket universe.
- Season 1 Episode 11: The Terratin Incident
The Enterprise crew begins to shrink after radiation exposure.
- Season 1 Episode 10: Mudd's Passion
Space con artist Harry Mudd returns, selling a fake love potion.
- Season 1 Episode 9: Once Upon a Planet
Kirk returns to a planet for shore leave but finds that it is less peaceful than he remembers it to be.
- Season 1 Episode 8: The Magicks of Megas-Tu
At the center of the galaxy, the Enterprise discovers a race of powerful aliens.
- Season 1 Episode 7: The Infinite Vulcan
A mad scientist has developed a race of intelligent plant life.
- Season 1 Episode 6: The Survivor
The Enterprise finds a long-lost explorer (Ted Knight).
- Season 1 Episode 5: More Tribbles, More Troubles
Cyrano Jones introduces tribbles that cannot reproduce.
- Season 1 Episode 4: The Lorelei Signal
A race of beautiful women remains immortal by stealing the life force of men.
- Season 1 Episode 3: One of Our Planets Is Missing
A mysterious cloud destroys inhabited planets.
- Season 1 Episode 2: Yesteryear
Spock travels back in time to prevent his death as a young Vulcan.
- Season 1 Episode 1: Beyond the Farthest Star
The Enterprise finds a deserted starship orbiting a dead star.