Star Trek: The Animated Series

The IMDB lists these tibits:

• Originally the show was not going to include Nichele Nichols, George Takei, and Walter Koenig due to budget considerations. However, when Leonard Nimoy learned about this, he refused to join the cast unless his friends were included. Rather than lose the most popular cast member, Filmation agreed to sign on Nichols and Takei and while Koenig could not be included because of the budget, he wrote one episode, "The Infinite Vulcan."
• The episode "The Practical Joker" is essentially the origin of the holodeck.
• This series is not counted in the official continuity of the Star Trek universe, with the exception of the episode "Yesteryear" in which Spock goes back in time to save himself as a boy on Vulcan and help his younger self through a critical decision in his life.

The Animated Series Episodes

First aired 1973-1974

Episode                                  Original Air Date      Mission Stardate
Beyond the Farthest Star           September 8, 1973                5521.3
Yesteryear                         September 15, 1973               5373.4
One of Our Planets is Missing      September 22, 1973               5371.3
The Lorelei Signal                 September 29, 1973               5483.7
More Tribbles, More Troubles       October 6, 1973                  5329.4
The Survivor                       October 13, 1973                 5143.3
The Infinite Vulcan                October 20, 1973                 5554.4
The Magicks of Megas-Tu            October 27, 1973                 1254.4
Once Upon A Planet                 November 3, 1973                 5591.2
Mudd's Passion                     November 10, 1973                4978.5
The Terratin Incident              November 17, 1973                5577.3
The Time Trap                      November 24, 1973                5267.2
The Ambergris Element              December 1, 1973                 5499.9
Slaver Weapon                      December 15, 1973                4187.3
The Eye of the Beholder            January 5, 1974                  5501.2
The Jihad                          January 12, 1974                 5683.1
The Pirates of Orion               September 7, 1974                6334.1
Bem                                September 14, 1974               7403.6
The Practical Joker                September 21, 1974               3183.3
Albatross                          September 28, 1974               5275.6
How Sharper Than A Serpent's Tooth October 5, 1974                  6063.4
The Counter-Clock Incident         October 12, 1974                 6770.3

Star Trek Episodes