Doctor Who: EVERY Version Of The Daleks Explained

During the Dalek Wars of the far future, a battered Time War-style drone drifted off into space while suffering a radiation leak, before witnessing the birth of a star. This experience led him to develop a sense of morality, and an unprecedented hatred for his own race.

This Dalek was later salvaged by the Combined Galactic Resistance, a human force doing battle with the Daleks, and was taken aboard their command ship Aristotle, where it was held prisoner.

The Twelfth Doctor later arrived and nicknamed the Dalek "Rusty". Curious to find out whether there really is such a thing as a good Dalek, he ventured inside its casing – which, by this point, had been embellished with various cables and components.

After healing Rusty, and inadvertently turning him back into an ordinary Dalek, the Doctor successfully managed to reinstate Rusty's sense of morality – but not without also passing on his own hatred for the Daleks!

The result was a Dalek that was, by human standards, "good" – but was nevertheless still consumed by hate.

Rusty continued to fight the Daleks for billions of years and soon gained legendary status as a unique Dalek that had actually turned on his own kind.

He settled in the ruins of the planet Villengard where the Twelfth Doctor encountered him once again, shortly before his regeneration, in order to connect to the Dalek Hive Mind (the shared intelligence of the Daleks) and discover the truth about Testimony.