This was one of the first episodes of Red Dwarf i ever watched, due to my parents being big fans of the show. I decided to give this episode a go and i was hooked straight away.
It follows the Cat, Lister and Kryten's attempts to survive in Quarantine, under the watchful eye of Rimmer. However, when they're are in Quarantine, Rimmer is exposed to the rays of a crazy doctor, making him crazy. The craziness of Rimmer leads to some classic Red Dwarf scenes, including Rimmer in a gingham dress and his consulations with Mr Flibble.
I would recommend this episode to everyone, it might get them hooked the way i did.