Captain Pike is taken prisoner by the inhabitants of Talos IV.
Kirk attempts to maroon an old friend on an unpopulated planet after he mutates into a dangerously powerful psionic being.
A creature that survives on salt, stolen from the bodies of its vicitms, terrorizes the Enterprise crew.
The Enterprise picks up an unusual teenage boy.
Sulu swordfights topless in the halls, Kevin Reilly can't seem to stop singing 'I'll Take You Home Again Kathleen,' and Spock cries.
You're not seeing double: A transporter malfunction has split Captain Kirk in two.
Kirk and crew first meet the notorious con-artist Harry Mudd.
We learn that Nurse Chapel has a fiance, but he's been missing for quite some time... and has more than a few secrets.
Kirk and Co. beam down to a planet whose population become sick and die when they reach puberty. The landing party soon contracts the disease themselves.
Kirk and a crewmember are held hostage on a rehabilitation colony. The first ever mindmeld is performed on an escapee from the colony.
Hey! Isn't that Ron Howard's little brother?
Spock hijacks the Enterprise to return a former captain to the forbidden planet Talos IV.
A troupe of actors board the Enterprise, attempted murder soon ensues.
First appearance of the Romulans and... HEY isn't he Spock's dad?!?
White rabbits, princesses, and FINNEGAN!
Two men die under Spock's first command and when all logical options are exhausted he reasons that it's time for an act of desperation.
SPOILER ALERT: Trelane, the seemingly omnipotent alien being, is actually a child.
Best fight in TV history: Kirk vs. The Gorn.
Kirk has to return a 20th century man home so that he can father his son and thus preserve the timeline.
Kirk faces inquiry in the alleged death of a crewman and old friend.
SPOILER ALERT: The society is run by a computer called Landru.
A group of genetically altered 'supermen' are woken from their cryogenic sleep by Kirk and Co. They soon attempt to take control of the ship.
Kirk and crew are stranded on a planet whose population has been fighting a computerized war.
The spores of an alien planet are taking control of Kirk's crew.
SPOILER ALERT: She's called a Horta, and she only started attacking the miners because they broke into the nursery and started smashing her eggs.
The Klingons make their first ever appearance and Spock gets his mind sifted.
A man learns that he and his counterpart must enclose themselves in the 'anti-matter universe' lest they destroy the universes paralleling it.
SPOILER ALERT: Joan Collins must die to restore the timeline.
Spock gets stung by what appears to be fake rubber vomit, suffers severe pain, and gets blinded... but only temporarily.
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