Amy and Rory summon the Doctor to Leadworth, and he admits he has not found Melody. They are met by Mels, their childhood friend responsible for Amy and Rory's relationship and whom Amy named Melody after. Mels hijacks the TARDIS and causes it to spin out of control and crash into Hitler 's office in 1938 Berlin . They accidentally save Hitler, as they disrupted a Teselecta , a shapeshifting robot piloted by miniaturised people to punish criminals, from killing him. Before Rory locks him away, Hitler shoots at the Teselecta but hits Mels instead. Instead of dying, however, Mels begins to regenerate into another incarnation which they recognise as River Song. She attempts to kill the Doctor several times before she kisses him; he discovers her lipstick was laced with poison that will kill him in 32 minutes. The Teselecta identifies River as responsible for the Doctor's death and thus a criminal, but Amy and Rory plead they not torture her and turn the Teselecta's security robots against the crew, who promptly teleport out. River saves the dying Doctor by giving up all her remaining regenerations.