Chrissie becomes increasingly worried by Simon's strange behaviour, and decides upon a desperate solution. Harry reveals his disturbing secret to Lucy, and they rejoin the remaining four to discover that dingoes have wrecked the camp. Meanwhile, David has a remarkable encounter which confirms his belief in aliens.

Sarah finds Melissa's camera, confirming that she was abducted. Chrissie discovers a tyre track and maybe a new route out of the camp. Simon's delirium worsens. Chrissie and Simon discover a shack.