The 15 Coolest Planets That Don't Exist

The perfect example of crowd control gone wrong, Miranda is the source of the terrifying Reavers from the Firefly universe, and a big source of the nightmares that haunt River. It was a perfectly terraformed world where everything went wrong when the government started using experimental drugs to make the people docile. Unfortunately, for most people it worked too well, and for a small portion, it turned them into Reavers. Seriously crazy stuff!