Jack is in hospital - there's something wrong with his leg. But when he catches a glimpse of his X-ray, Jack doesn't expect to see a huge, squirming thing writhing around inside. It turns out two of his best mates have the same problem. And the doctors won't tell them anything. Then the burning and ...

Jack is in hospital - there's something wrong with his leg. But when he catches a glimpse of his X-ray, Jack doesn't expect to see a huge, squirming thing writhing around inside. It turns out two of his best mates have the same problem. And the doctors won't tell them anything. Then the burning and hissing starts.