Episode five covers the science behind John Carpenter's 1978 Halloween. Is Halloween more dangerous than any other day of the year? What happened in the case of the Liske family murders? Could Michael's parents have been warned about his violent tendencies by the MacDonald Triad? Why does Michael wear a mask? Finally, would Michael really have been able to escape from Smith's Grove? Ask John Straffen, who escaped from a mental hospital for the criminally insane in England.