Reviews for The Animated Series were written retrospectively in 2023. Note: All reviews contain spoilers.
Season 1 (1973-1974)
Introduction — A preface about the long road in getting around to writing reviews for this series, and some commentary on the series overall.
9/8/1973. Beyond the Farthest Star — The Enterprise discovers an ancient, abandoned starship orbiting a dead star, which carries a threatening presence.
9/15/1973. Yesteryear — Spock travels back in time to prevent his own death as a child on Vulcan.
9/22/1973. One of Our Planets Is Missing — The Enterprise must intervene when a mysterious cloud that consumes entire planets threatens a Federation colony.
9/29/1973. The Lorelei Signal — The men aboard the Enterprise are drawn to a planet by the alluring song being transmitted by its female inhabitants.
10/6/1973. More Tribbles, More Troubles — The Enterprise takes on a familiar passenger and faces off against an old foe while dealing with a new batch of troublesome tribbles.
10/13/1973. The Survivor — The Enterprise crew rescues a human survivor who has been missing for five years, but they soon realize he might not be who he seems.
10/20/1973. The Infinite Vulcan — A landing party visits a planet of sentient plant-based lifeforms who show a particular interest in Spock.
10/27/1973. The Magicks of Megas-Tu — The Enterprise travels to the center of the galaxy, where they find the known laws of reality no longer apply and are instead governed by magical beings.
11/3/1973. Once Upon a Planet — The computerized system in control of a vacation world's fantasy environment decides to hold Uhura prisoner in an attempt to change its fundamental purpose.
11/10/1973. Mudd's Passion — Con man Harry Mudd, facing arrest from Kirk for a litany of Federation violations, makes an unexpected offer of a love potion to Nurse Chapel.
11/17/1973. The Terratin Incident — While investigating a distress call, the Enterprise is enveloped by an energy beam that causes the entire crew to shrink.
11/24/1973. The Time Trap — During a confrontation with the Klingons, the Enterprise becomes trapped in an area of space known for numerous ship disappearances, where they encounter a mysterious society.
12/1/1973. The Ambergris Element — While studying an alien world with an underwater society that distrusts surface dwellers, Kirk and Spock are physiologically transformed so they can only breathe underwater.
12/15/1973. The Slaver Weapon — Spock, Sulu, and Uhura discover an ancient weapon from a long-dead society that is coveted by alien pirates who want to unlock its secrets.
1/5/1974. The Eye of the Beholder — The Enterprise investigates the disappearance of a science team on a mysterious world.
1/12/1974. The Jihad — Kirk and Spock are recruited into a secret mission to recover a religious artifact from a volatile planet in order to prevent a catastrophic holy war.
Season 2 (1974)
9/7/1974. The Pirates of Orion — When Spock is afflicted with a life-threatening illness, the Enterprise must engage Orion pirates who have stolen a shipment containing the rare drug needed to save Spock's life.
9/14/1974. Bem — The Enterprise takes on an independent observer from an alien world, who insists on accompanying the landing party on a research mission of a primitive alien civilization.
9/21/1974. The Practical Joker — When the Enterprise passes through an energy cloud, the computer begins malfunctioning and pulling practical jokes upon the crew.
9/28/1974. Albatross — McCoy is arrested by an alien government and accused of causing a deadly plague during a visit nearly two decades earlier.
10/5/1974. How Sharper Than a Serpent's Tooth — The Enterprise follows a probe of unknown origin into deep space, where they find an alien entity with mysterious ties to ancient Earth civilization.
10/12/1974. The Counter-Clock Incident — An alien ship pulls the Enterprise into a supernova, transporting the ship to an alternate universe where time runs backward.