On the night before her wedding , Gwen Cooper ( Eve Myles ) is bitten on the arm by a male shape shifting alien . Her boss , Jack Harkness ( John Barrowman ) kill the alien , and Gwen attend her hen night though is troubled by her wound . She wake up the next morning heavily pregnant . Jack arrive along with Torchwood 's medic Owen Harper ( Burn Gorman ) to examine Gwen and try to persuade her to cancel her wedding . Gwen 's fiancee Rhys ( Kai Owen ) also try to postpone the wedding in Gwen 's interest but Gwen insist that the wedding go ahead as she desire nothing more than to marry him . The sudden pregnancy is explained to Gwen and Rhys ' families as their own child . Gwen 's mother ( Sharon Morgan ) and father ( William Thomas ) are excited at the prospect of a grandchild , but Rhys ' parents suspect Gwen of being pregnant by another man . Torchwood agent Toshiko Sato ( Naoko Mori ) is sent to the wedding venue to keep an eye on Gwen and to deliver a new wedding dress to accommodate her alien pregnancy .