In Ryan Scott's episode, Torchwood are chasing aliens down the M4, when Jack accidentally blows a hole in the Severn Bridge, and the SUV hits the water. Whilst submerged John, Gwen and Ianto hear a strange noise, which, back at the Hub they realise is a cry for help. They track the cry to its source which turns out to be the deepest part of the Ocean - the Mariana Trench. Ianto rings old Torchwood flame, Carlie Roberts, who's an expert in marine geology, and Jack pulls strings with the US government to get them all on board the USS Calvin, an Arleigh Burke class destroyer, which is heading for the Trench. From there they board the Octopus Rock, the only submarine built to withstand the pressure at that depth, and follow the signal. But when the Submarine crashes, the team are left at the mercy of a hungry alien.

The brewery have called 'time' and it's the last night at The House of the Dead - the most haunted pub in Wales. Barry the barman has invited renowned psychic, Mrs Wintergreen, to hold a special seance to mark the occasion, and there's a big crowd hoping for the chance of seeing their deceased loved ones for one last time. But when Jack arrives on the scene, he's determined to stop them. Ianto is puzzled by Jack's behaviour, and Gwen is suspicious. Why is Jack acting so strangely? Then the ghosts start arriving - and all hell breaks loose.