Something in the Water
Tosh and Gwen investigate ghostly apparitions in the marshy areas of South Wales. It's been a dull month and they're just about to pack up when they discover a dead body. The Team find that there's been a massive spike in respiratory infections right across the UK. Captain Jack agrees that it's worth investigating, but at the moment his priority is Tosh and Gwen's work: they've brought the corpse back for examination. It's old, in an advanced state of decay, and still able to talk.