sentences:  It was used in two science fiction television programs, originally appearing in the BBC's cult sitcom "Red Dwarf", and later on in the U.S. drama "seaQuest DSV".The concept of GELFs is explored in several episodes of "Red Dwarf" including "Polymorph" (1989), "Camille" (1991), "Psirens" (1993), "" (1993), and "Krysis" (2016).The writers of the series had stated early on in production that they did not want any aliens to exist in their show's universe; but as the series continued, in order to provide a stream of characters for the main crew to interact with, their cosmos was gradually populated with deranged robots and bizarre creatures that turned out to be the result of genetic engineering.