Rust cloud

Rust cloud captured by magnets. (COMIC: Plague of Death)

The rust plague was a virus that attacked the Daleks' metal casings, destroying them.

It was created on Skaro when an accident at a weapons factory produced a radioactive cloud of metal-eating rust that destroyed a tracking station. The Daleks working there and a squad of Daleks on hoverbouts tried to destroy it. Their Brain Machine advised destroying the cloud by trapping it in a magnetic field and then spraying it with oil vapour.

Rust plague Black Dalek TV21PlagueofDeath

Black Dalek effected by plague. (COMIC: Plague of Death)

This created a viral form of the cloud, which turned the Black Dalek Leader into a carrier of the plague. He unknowingly infected and destroyed all Daleks who came into contact with him. When the Dalek Emperor returned from Solturis, he realised that the Black Dalek was the carrier and had his casing reconstructed. (COMIC: Plague of Death)

The plague proved a sufficient distraction to the Daleks which allowed the Monstrons to invade Skaro undetected. (COMIC: The Menace of the Monstrons)

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