Amy and Rory are yelling at the Doctor about their missing daughter. Suddenly their best friend, Mels arrives, out of nowhere, while being chased by the police. Pulling a gun, she suggests “Let’s Kill Hitler.” In 1938, the Tardis lands in Hitler’s office at exact moment he is being killed by a Justice robot. While trying to deal with the fact that they just saved Hitler’s life, things suddenly get much more complicated with Mels.