Lister and Kryten have invented a triplicator: a device which can make triples of objects. They demonstrate it on the last strawberry in the universe and receive two exact copies. Lister samples one and reels from the taste, saying that it is brilliant, so succulent and divine. He tries the other and scrunches his face in disgust as we see that there are maggots crawling around in it. Kryten notes that the triplicator has put all the best qualities in one copy and the worst in the other. Lister attempts to reverse the process but causes an overload and Red Dwarf blows up. After the blast, they realise that they accidentally triplicated Red Dwarf and there are two copies left behind. The crew board the "High" ship to find their counterparts are monks and are all into the better side of things: spiritual happiness etc. Kryten finds half of the triplicator he needs to merge the ships to get the original back. They board the "Low" ship and it is horrible, the crew are monsters and have let the ship go into decay. The "High" crew are killed by various things (mostly by their own stupidity when they walk toward someone firing at them) and eventually they find the other half of the triplicator. The "Lows" capture Lister and implant him with a controlling device and program him to kill the others. Lister tries to kill the rest of the gang but Kryten successfully removes the implant, only to stick it into Cat who gets revenge on Lister for trying to kill him. Kryten throws the implant away and they leave the "Low" ship and regenerate the original Red Dwarf. Before they return, Lister accidentally sits on the implant but the crew cannot figure out who is controlling him until Cat shoots at a cupboard which emits a faint giggle and Lister's "Low" counterpart tumbles out. The Cat then decides to have a little fun with Lister and the implant... (thetvdb.com)