Rusty the Dalek

Rusty was the name given by the Twelfth Doctor to a Dalek captured by the forces of Combined Galactic Resistance. The Doctor repaired a crack in Rusty's power source that was leaking radiation and killing it, but this repair also eliminated the moral sense that Rusty had gained by witnessing the birth of a star.

Read more about this topic on the Tardis Data Core.
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