The South African-born writer/director Neill Blomkamp previously worked on short films connected with the video game Halo, and was slated to direct a feature based on the game, which may explain why this film has the enervating quality of a wet Tuesday in the arcade. More interestingly, it is based on his short, Alive in Joburg, and the battle between corporate jobsworths and an alien species with an unfortunate resemblance to prawns draws parallels with apartheid. This is not, mind you, a subtle allegory.