Top 10 "Star Trek: The Original Series" Episodes

Sorry, "The Trouble with Tribbles" doesn't make my Top Ten; I find it decidedly overrated. "I, Mudd" is a much better example of an effectively humorous, light-hearted episode.
Honorable mentions:
The Corbomite Maneuver (10)
I, Mudd (37)
The Ultimate Computer (53)
The Cloud Minders (76)
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1.
Star Trek (1966 TV Series)
Episode: Mirror, Mirror (1967)
    1 2 3 4 5 6 7 8 9 10 9.2/10 X  
A transporter accident places Capt. Kirk's landing party in an alternate universe, where the Federation is a barbarically brutal empire. (50 mins.)
 
2.
Star Trek (1966 TV Series)
    1 2 3 4 5 6 7 8 9 10 9.3/10 X  
When a temporarily insane Dr. McCoy accidentally changes history and destroys his time, Kirk and Spock follow him to prevent the disaster, but the price to do so is high. (50 mins.)
 
3.
Star Trek (1966 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
The flight recorder of the 200-year-old U.S.S. Valiant relays a tale of terror--a magnetic storm at the edge of the galaxy! (50 mins.)
 
4.
Star Trek (1966 TV Series)
Episode: Amok Time (1967)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
In the throes of his Pon Farr mating period, Spock must return to Vulcan to meet his intended future wife, betrothed from childhood. (50 mins.)
 
5.
Star Trek (1966 TV Series)
Episode: Space Seed (1967)
    1 2 3 4 5 6 7 8 9 10 8.9/10 X  
While on patrol in deep space, Captain Kirk and his crew find and revive a genetically engineered world conqueror and his compatriots from Earth's 20th century. (50 mins.)
 
6.
Star Trek (1966 TV Series)
Episode: Wolf in the Fold (1967)
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
Kirk and the Enterprise Computer become detectives after Scotty is accused of murdering women on a pleasure planet. (50 mins.)
 
7.
Star Trek (1966 TV Series)
Episode: The Doomsday Machine (1967)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
The USS Enterprise encounters the wrecked USS Constellation and its distraught captain who's determined to stop the giant planet-destroying robot ship that killed his crew. (50 mins.)
 
8.
Star Trek (1966 TV Series)
Episode: Balance of Terror (1966)
    1 2 3 4 5 6 7 8 9 10 9.0/10 X  
The Enterprise must decide on its response when a Romulan ship makes a destructively hostile armed probe of Federation territory. (50 mins.)
 
9.
Star Trek (1966 TV Series)
Episode: A Taste of Armageddon (1967)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
Kirk and Spock must save their ship's crew when they are declared all killed in action in a bizarre computer simulated war where the actual deaths must occur to continue. (50 mins.)
 
10.
Star Trek (1966 TV Series)
Episode: Day of the Dove (1968)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
Both humans and Klingons have been lured to a planet by a formless entity that feeds on hatred and has set about to fashion them into a permanent food supply for itself. (50 mins.)