Nazis! River on the rampage! Regeneration! It’s all happening after the TARDIS crash-lands in 1930s Berlin.
The Doctor (Matt Smith) and his companions Amy Pond (Karen Gillan) and her husband Rory Williams (Arthur Darvill) crash land in 1938 Berlin when the TARDIS is hijacked by Amy and Rory’s childhood friend, Mels (Nina Toussaint-White). They accidentally save Adolf Hitler (Albert Welling) who was scheduled for torture by the Teselecta, a time-travelling justice department. When shot by Hitler, Mels unexpectedly regenerates into River Song, the grown version of Amy and Rory’s child who had been taken away from them. As River is a criminal herself due to her future execution of the Doctor, the Teselecta pursue her instead, whilst the Doctor faces death from her poisoned lipstick.