The concept appears frequently as a comedic gag in numerous television programs as well. In a 1981 episode of the Canadian sketch comedy series "Bizarre", the show’s resident daredevil character Super Dave Osborne (Bob Einstein) performs, as one of his many stunts, carrying and giving birth to a baby. In the BBC science fiction comedy series "Red Dwarf", the main character Dave Lister becomes pregnant after having sex with a female version of himself in an alternate universe. In an episode of "Sliders", the quartet "slides" into an alternate world in which babies develop during their final months in the father because a worldwide disease has kept women from being able to carry children beyond their first trimester. In the popular fantasy series "Charmed"s fifth season, during a dream spell gone wrong, Leo ends up pregnant with Piper's baby for a good deal of the episode, leading to her referring to him as an "incubator" and at times berating him for "upsetting the baby". In "Doctor Who" (series 11), an episode features a man going into labor pain. In the "Ozzy & Drix" episode "Ozzy Jr.", Ozzy thinks he is having a baby but is actually a parasite growing in his belly caused by an infection by Strepfinger. In the "Ren & Stimpy "Adult Party Cartoon"" episode "Stimpy's Pregnant", Stimpy is thought to be pregnant but Mr. Horse finds out that he is actually constipated.