The Sperm Bank was an operational cryobank aboard the JMC mining spaceship Red Dwarf. It was presumably run by Doc Newton and/or the Medi-Bot, and held the DNA of some - if not all - of the male human members of the crew. Three million years later aboard Starbug, the last human being Dave Lister received a distress call from his old girlfriend Kristine Kochanski on a wrecked ship. Kochanski claimed that she had also been in stasis, and had twin sons with Lister - Jim and Bexley Lister - which had conceived through use of the sperm bank on Red Dwarf, all without Dave's knowledge.