Giant pink tribbles. Spock casting magic spells. The crew turning into babies, growing gills, or shrinking. Is there no weirdness that failed to occur on Star Trek: The Animated Series?
No. No, there isn’t. And that’s why the show, which ran from 1973-74, is pure, unadulterated awesome.
Though it occupies a dubious position in Trekkie canon, The Animated Series is a must-see for fans, who will be treated to a succession of wacky events involving the almost the entire cast of The Original Series.
Inexplicably, Chekov is gone. Equally inexplicably, every single alien being sounds suspici
ously like Scotty, Nurse Chapel or Uhura. Actually, the explanation was saving money by not hiring extra voice actors or Chekov’s actor, Walter Koenig.
But this enabled them to do something the Original Series could never do, by crewing the Enterprise with more aliens. Foremost among them are the six-limbed Arex, who occupies Chekov’s seat most of the time, and M’Ress, a cat-woman communications officer.
At the time of the Original Series, I don’t think it would have been possible to have shown a guy with an extra arm and leg, like Arex had, and M’Ress would have had a somewhat wooden expression if she’d been a real person with a face covered with fur.
And then there’s the fact that one of the people working on the show was colorblind.
As a result, Klingons wear pink and purple, and
the Kzinti, who are supposed to be terrifying telepathic cat-wolverine-people, do too.
Plus there are pink tribbles. Giant pink tribbles. If there were a way to market these to 12-year-old girls Earth would be drowned in tribbles in a matter of hours. Talk about weapons of mass destruction!
Then there’s the elevator-music theme song, which definitely is worse than the theme song from Star Trek: Enterprise, no matter what anybody says, although the animated Enterprise is so darn cute it’s easy to forgive the tune.
If you have Netflix and loved Original Series Star Trek, or just want to kill a few hours watching pure, undiluted insanity in the form of the loopiest plots ever seen in any flavor of Star Trek, check out Star Trek: The Animated Series.
For more information, check out Memory Alpha, the go-to place for online information on Star Trek, and also the source of every picture above.

Although the show is not perfect and sometimes suffers from overproduced music and predictability, it is pretty darned good. Some of the characters began as cliches, including the all-American boy football player, the snotty, blonde head cheerleader and the insane over-achieving drama queen, but continue to develop in unexpected ways.
An astonishing amount of female eye-candy is featured in Star Trek, the original series. It seems like every episode has some new, scantily clad female guest star, who usually falls hard for Kirk, but sometimes, just for a change, goes for Spock, Scotty or McCoy.
to let her die in order to restore the course of history in one of Star Trek’s most famous episodes, "The City on the Edge of Forever."
Unless you count William Shatner, who even at the time had a bit of a paunch, there is no corresponding male eye candy, or if there is, it’s been so thoroughly 
I’m not saying they’re feminist episodes, because often they aren’t.