S02E09: 'Something Borrowed'

Gwen turns up at her hen night with a bandaged bite on her arm, the result of an encounter with a male shapeshifting alien that Captain Jack managed to kill. On the morning of her wedding, Gwen is shocked to see a huge bump on her stomach and tests reveal that the alien managed to impregnate her with an egg.

Rhys is initially angry, but the couple agree to go ahead with the wedding and use the cover story that it is their child. However, Owen's autopsy of the shapeshifter reveals that it is a Nostrovite - a species who hunt in pairs with the female accustomed to ripping her baby out of the host's stomach after the male has transferred the eggs. The Torchwood team heads to the hotel where the wedding is set to take place.

At the wedding, Banana - one of Rhys's friends - and Tosh are soon tied up in a web after the female Nostrovite catches them. Pursued by members of Torchwood, the alien alternates between adopting the guise of Rhys's mother and Jack, with the latter almost sharing a snog with Gwen before being scared off. Rhys, following Owen's instructions, manages to remove the alien baby from Gwen's stomach in a barn using the singularity scalpel. The Nostrovite arrives at the scene and is immediately blown away by Jack with his large weapon.

After the threat is repelled, Gwen and Rhys finally tie the knot and Jack subsequently spikes the guests' drinks with the memory-wiping retcon drug at the reception. After sharing a tender dance with Ianto, Jack later reflects on his own previous marriage back at the Hub, looking at a vintage wedding photo featuring him and a former bride.