
If you watch any science-fiction film from the first half of the 20th Century, you’re most likely to find a world populated with small, green aliens, usually labelled ‘Martians’ (for serious want of a better name), maybe sporting an extra eye or ear or something. For the first generation of science-fiction films, this was the typical extra-terrestrial, exemplified perhaps in Looney Tunes’ Marvin the Martian (okay, so maybe he wasn't green, but his...