"Demons and Angels" is the fifth episode of science fiction sit-com Red Dwarf Series V[ and the twenty ninth in the series run. It was first broadcast on the British television channel BBC2 on 19 March 1992. Written by Rob Grant & Doug Naylor, the episode was the first to be filmed with new director Juliet May. The episode has the regular Red Dwarf crew meet their 'high' and 'low' versions
Kryten has created a Triplicator, derived from the Matter Paddle, which he hopes will solve any supply problems that might arise on Red Dwarf. It can create two copies of anything placed within its field, but the prototype machine soon manifests several flaws. Firstly, the copies have a lifespan of exactly one hour. Secondly, while one copy exhibits all the best qualities of its original, the other has all the worst. Finally, when Kryten tries to reverse the procedure, Red Dwarf begins to explode, although this is explained by the mistake Kryten made by reversing the field of the beam, capturing the rest of Red Dwarf.