With most of the team trapped in the bunker with the menagerie of future predators, Leek releases a Silurian sand scorpion at a busy beach and threatens to let loose more horrors. Stephen is the only one who can battle the scorpion, and as he does so, Cutter and the others plot their escape - only to realise that if they do, they will unleash the creatures around them. Last in series. With Douglas Henshall, James Murray, Andrew-Lee Potts, Hannah Spearritt, Ben Miller, Juliet Aubrey, Lucy Brown, Karl Theobald, Naomi Bentley, Claire Spence, Robin Pirongs and Elliott James Langridge.