Many people think "Spock's Brain" was the worst.
There are 726 episodes of Star Trek in total: 79 episodes of The Original Series + 1 pilot 22 episodes of The Animated Series 178 episodes of The Next Generation 176 episodes of Deep Space Nine 172 episodes of Voyager 98 episodes of Enterprise
Star Trek: The Original Series episode airdates can be found on Memory Alpha, the Star Trek Wiki.
In Star Trek The Original Series Kirk appears in 79 episodes.
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There exist 80 episodes beginning StarDate 1966 through StarDate 1969. Access link:
New episodes aired from Thursday, September 8, 1966 until Tuesday, June 3, 1969.
For legal copies you can access Amazon - they have them in episodes - Answers.com does not support illegal downloads (Pirating )
Star Trek (aka The Original Series) 1966-1969ST: The Animated Series 1973-1974ST: The Next Generation 1987-1994ST: Deep Space Nine 1993-1999ST: Voyager 1995-2001Enterprise 2001-2005Discovery 2017-Current
The best 'original' series episode to show someone who has no idea about "Star Trek" is the episode entitled "The Trouble with Tribbles". It captures the spirt of the original series perfectly.
Star Trek TOS (The Original Series) has 80 episodes in all. I was jut watching South Park when the subject came up they had it at 72. I know for a fact that it is 79 original episodes of Star Trek over a stretch of 3 seasons :-)
The original Star Trek ended in 1969 as NBC cancelled the series after just 3 seasons.
Lucky Star has 24 episodes and one OVA (Original Video Animation) .