 The episode centers on the marriage of Torchwood employee Gwen Cooper ( Eve Myles ) to her long @-@ term partner Rhys Williams ( Kai Owen ) . The wedding is complicated by Gwen 's sudden impregnation by a shape @-@ shifting alien Nostrovite . Although she resolves to see her wedding through , her nuptials are interrupted by an attack from the biological mother of the alien fetus ( played successively by Collette Brown , Nerys Hughes and John Barrowman ) . With the help of Rhys and Gwen 's Torchwood colleagues the fetus is neutralised and the attacking alien defeated . Gwen and Rhys marry , and their families have their memories of the wedding day wiped . 
 The episode <a href='uninflect' title='1'><mark>centers</mark></a> on the marriage of Torchwood employee Gwen Cooper ( Eve Myles ) to her long @-@ term partner Rhys Williams ( Kai Owen ) . The wedding is complicated by Gwen <a href='null_genetive' title='2'><mark>'s</mark></a>sudden impregnation by a shape @-@ shifting alien Nostrovite . Although she <a href='uninflect' title='3'><mark>resolves</mark></a> to see her wedding through , her nuptials are interrupted by an attack from the biological mother of the alien fetus ( played successively by Collette Brown , Nerys Hughes and John Barrowman ) . With the help of Rhys and Gwen <a href='null_genetive' title='4'><mark>'s</mark></a>Torchwood colleagues the fetus is neutralised and the attacking alien defeated . Gwen and Rhys marry , and their families have their memories of the wedding day wiped . 
Da episode center on the marriage of Torchwood employee Gwen Cooper ( Eve Myles ) to her long @-@ term partner Rhys Williams ( Kai Owen ) . Tdawedding is complicated by Gwen  sudden impregnation by a shape @-@ shifting alien Nostrovite . Although she resolve to see her wedding through , her nuptials r interrupted by an attack from thdaiological mother of the alien fetus ( played successively by Collette Brown , Nerys Hughes and John Barrowman ) . With the help of Rhys and Gwen  Torchwood colleagues the fetus is neutralised and the attacking alien defeated . Gwen and Rhys marry , and their families have their memories of the wedding day wiped .