: The Doctor gives River her iconic blue TARDIS-shaped diary , marking the beginning of their complicated, "backwards" timeline together.
: A shape-shifting justice robot crewed by miniaturized humans from the future arrives to punish Hitler. However, they shift their focus to River, identifying her as the "greatest war criminal in the universe" for her future role in killing the Doctor. [S6E8] Let's Kill Hitler
: It is revealed that the TARDIS itself taught River how to pilot it, which explains why she is often more proficient than the Doctor. : The Doctor gives River her iconic blue
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
: While biologically human (conceived in the Time Vortex), medical scans in this episode suggest River may have two hearts , mirroring Time Lord physiology. Episode Significance River Song | Tardis - Doctor Who Wiki