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Entering a wormhole in space, Moya and her crew are trapped in a dank and dismal black hole. Worse still, Moya burns from within thanks to a parasite that threatens to devour the ship, but not before starting small and painful fires along the way. To top it off, the untrustworthy Rygel (Jonathan Hardy) is briefly appointed the captain of Moya -- and Aeryn (Claudia Black) announces that she's pregnant. "Natural Election" was initially telecast on July 19, 2002.