If you think the Star Trek episode “The Trouble with Tribbles” is bad, just wait until you have to watch the cartoon version of the episode. The worst one is the Star Trek Deep Space Something or Other episode. It’s like a cheesy flashback episode with bits of fur. All of these episodes are on the same disc of the Star Trek boxed set.
If you’ve never had to see this episode, you’re not missing much. It’s balls of fake fur that take over the ship. There’s a great scene where William Shatner is armpit-deep in dead tribbles, and he’s laughing!