The Mark of The Rani is the third serial of the 22nd season of the British science fiction television series Doctor Who, which was first broadcast in two weekly parts on BBC1 on 2 and 9 February 1985.
When the Sixth Doctor and Peri arrive in the 19th-century mining town of Killingworth, they encounter a group of rampaging miners attacking people and destroying machinery. The attacks are the work of two rogue Time Lords, The Master and the Rani.
The Rani’s experiments on her home planet of Miasimia Goria have left its inhabitants unable to sleep. In an attempt to fix the problem, she has begun harvesting brain fluid from the Killingworth miners and synthesising it back on Miasimia Goria. The Master wants to use the finest brains of the Industrial Revolution to help speed up Earth’s development and use the planet as a powerbase.
The Doctor sneaks into the Rani’s TARDIS, whose control room contains jars of preserved dinosaur embryos, and overhears Rani confessing to have laid landmines in nearby Redfern Dell. Simultaneously, Peri is using her botanical knowledge to make a sleeping draught for the afflicted miners, but her quest for herbs leads her to Redfern Dell. The Doctor then surprises the Master and the Rani, who are lurking at the edge of the Dell, and takes them prisoner with the Master’s own Tissue Compression Eliminator.
They attempt to flee in The Rani’s TARDIS, but the Doctor has sabotaged the navigational system and velocity regulator, and the ship starts heading out of control. In the destabilised condition, one of the jars containing an embryo Tyrannosaurus Rex falls to the floor and the creature begins to grow.
The Master and the Rani are “stuck” against one of the walls of the Rani’s TARDIS due to the speed at which they are travelling and are helplessly at the mercy of the rapidly aging immature Tyrannosaurus.
The Doctor and Peri return the stolen brain fluid to prominent local citizens Lord Ravensworth and George Stephenson with instructions to administer it to the affected miners.
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To view the list of other Doctor Who serials, please click this link
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