In the period between the original's cancellation and the resurgence of the franchise via the movies, there was an animated version of the series that ran for two years on NBC. While not up to the Disney standard, the show did feature most of the actors (Walter Koenig, the sole member absent), great incidental music, and many of the same scriptwriters of the sci-fi classic.
This particular tape features one of the best episodes of the series: "The Slaver Weapon." A tightly-told show that allows greater use of Uhura, the character voiced by Nichelle Nichols, as she, Spock, and Sulu are held captive by a race that wishes to make use of a "doomsday" device left abandoned on a desolate world. The various transformations of the weapon, each deadlier than the former, make for a most intriguing story.
The animated version was able to do some things that would've been impossible to create on the original's budget. A great tale is woven in "The Slaver Weapon."
Unlike earlier reviewers, I find the other installment "The Ambergris Element" to be less interesting. Thus, I can't give it five stars.