In the Doctor Who episode (Series 6, Episode 8), the Doctor, Amy, and Rory travel to 1938 Berlin. This episode serves as a pivotal origin story for River Song , revealing her childhood as "Mels" and her ultimate transformation. Key Plot Developments
: It is revealed that the TARDIS itself taught River how to pilot it, which explains why she is often more proficient than the Doctor. [S6E8] Let's Kill Hitler
: The Doctor gives River her iconic blue TARDIS-shaped diary , marking the beginning of their complicated, "backwards" timeline together. In the Doctor Who episode (Series 6, Episode
: Brainwashed by the Silence, River poisons the Doctor with "Judas Tree" venom, which prevents regeneration. marking the beginning of their complicated