These Martian invaders had become infamous by being accidentally profiled in a documentary by Monty Python in which large white puddings, blancmanges, came from outer space and conquered Great Britain. Unfortunately, these alien desserts discovered that nobody noticed the difference in Great Britain, since nobody really wanted it anyway, so they left for Venus where the weather was warmer and drier and there was a 24/7 radio station playing Frankie Avalon. They were right.