My Top 10 List of Star Trek Episodes "The Original Series" 
To me the first season of Star Trek was by far the best of the three seasons that were filmed. I could have almost picked any ten of the episodes from that first season for my list. Below are my selections from #1 to #10, I included links to hulu where you can watch the episodes for free.

 

#1. The City on the Edge of Forever (April 6, 1967)
Season 1 - Episode 28 - When a temporarily maddened Dr. McCoy alters history and eliminates his time, Kirk and Spock follow him to prevent it, but the price to do so is high. 

 http://www.hulu.com/watch/283880 
 

#2. Balance of Terror (December 15, 1966)
Season 1 - Episode 14 - The Enterprise must decide on its response when a Romulan ship makes a destructively hostile armed probe of Federation territory.

 http://www.hulu.com/watch/283833 
 

#3. Space Seed (February 16, 1967)
Season 1 - Episode 22 - The Enterprise is taken over by Khan, a ruthless genetically augmented world conqueror and his compatriots from 20th century war-ravaged Earth.

 http://www.hulu.com/watch/283862 
 

#4. Arena (January 19, 1967)
Season 1 - Episode 18 - For bringing hostility into their solar system, a superior alien race pits Captain Kirk in an barehanded duel against the murderous reptilian captain of the Gorn alien ship he was pursuing.

 http://www.hulu.com/watch/283872 
 

#5. The Squire of Gothos (January 12, 1967)
Season 1 - Episode 17 - A powerful entity known as Trelane creates a planet and wants to play with the Enterprise crew.

 http://www.hulu.com/watch/283830 
 

#6. This Side of Paradise (March 2, 1967)
Season 1 - Episode 24 - The Enterprise investigates a planet whose colonists should be dead, but are not.

 http://www.hulu.com/watch/283854 
 

#7. Errand of Mercy (March 23, 1967)
Season 1 - Episode 26 - With a war with Klingons raging, Kirk and Spock attempt to resist an occupation of a planet with incomprehensibly placid natives.

 http://www.hulu.com/watch/283856 
 

#8. The Menagerie, Part 1 (November 17, 1966)
Season 1 - Episode 11 - Spock kidnaps the crippled Capt. Pike, hijacks the Enterprise and then surrenders for court martial.

 http://www.hulu.com/watch/283842 
 

#9. The Menagerie, Part 2 (November 24, 1966)
Season 1 - Episode 12 - At Spock's court martial, he explains himself with mysterious footage about when Capt. Pike was kidnapped by powerful illusion casting aliens.

 http://www.hulu.com/watch/283843 
 

#10. The Devil in the Dark (March 9, 1967)
Season 1 - Episode 25 - The Enterprise is sent to a mining colony that is being terrorized by a mysterious monster.

 http://www.hulu.com/watch/283855 
 

 
 
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