As I always point out, the animation for this show is pure crap. Low cell counts (with jerky, robotic movements) and ugly drawings are the norm for this series--and this one is unfortunately no exception. Even by 70s TV cartoons, this one is butt ugly.
The show begins with Romulans attacking Enterprise. The Captain takes the ship through an energy field to avoid them and in the process the computer aboard the ship is affected--becoming goofy and with a bad sense of humor. Dribble glasses, pies in the face graffiti on the Captain's uniform and other simple-minded pranks start occurring and everyone aboard laughs like crazy. Mostly, however, it looks like stuff most children watching the show would have laughed at instead of adults. Well, they eventually discover that the computer is behind all this.
This episode is clearly one that kids would love--because they would have thought the computer's jokes were funny. As for older audiences (and it's amazing that adults really embraced this show), it's harder going due to its silliness--which grates on you after a while. My verdict is an 8 for kids and a 5 for adults.
By the way, it is interesting that this show debuts the holodeck-- something I incorrectly assumed was created on "Star Trek: The Next Generation".