Aliens have crash-landed in the Wild West and they're ready for a showdown in The Good, the Bad and the Alien Can the Doctor, Rory, and Amy work out which are the good guys and which are the bad? The Doctor finds himself trapped in a virtual world in System Wipe. As he tries to save the characters of the virtual world from being destroyed by a deadly virus, Amy and Rory must fight to keep the Doctor's body in the real world safe from the mysterious entity known as Legacy.