Alien Space Bats! FYI, Alien Space Bats is a phrase used in SF forums when something impossible happens and is never explained, usually as the premise of the story. Like when a island/city/aircraft carrier/military unit is suddenly, inexplicably transported through time or inter-dimensionally. The story is about their survival and when the big event is never explained, fans say "Alien Space Bats did it". ASBs have made it into the literature as well. In one of Stirling's "Sea of Time" or "Dies the Fire" series, an SF-aware character referred to ASBs when talking about their situation. Then Ken MacLeod's "Learning The World" had ASBs as characters. The writers were probably having fun making the invaders ASBs here.