"Parallel Universe" is the sixth episode of science fiction sitcom Red Dwarf series two,[1] and the twelfth in the show's run.
Written by Rob Grant and Doug Naylor, and directed by Ed Bye, the plot involves the Red Dwarf crew travelling to a parallel universe where they meet alternative versions of themselves.
Cat, expecting to encounter his female counterpart, is shocked to find it to be actually a male dog-like humanoid named Dog (Matthew Devitt).
[3] Holly and Hilly reveal that they need a day to repair the Hop Drive, leaving the two groups to decide to socialise in the disco for the night.
Lister and Rimmer are soon put off by their counterparts—the former criticising Deb on her qualities despite sharing them himself, and the latter resisting Arlene's overbearing sexual advances—while Cat and Dog disagree on dance techniques.
Despite this, Lister has sex with Deb, but is shocked in the morning when Arlene points out that men in their universe get pregnant, rather than women.
After he, Rimmer, Cat and Holly return to their Red Dwarf and universe, Lister conducts a pregnancy test.
[17] A video to accompany the release which starred Danny John-Jules as some of his Red Dwarf alter-egos, including Duane Dibbley, was also produced.
[18] Changes throughout the series included replacement of the opening credits,[19] giving the picture a colour grade and filmising,[20] computer-generated special effects of Red Dwarf[21] and many more visual and audio enhancements.