Time and the Rani is the first serial of the 24th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 7 to 28 September 1987. It was the first to feature Sylvester McCoy as the Seventh Doctor.

In the serial, the renegade Time Lady the Rani (Kate O'Mara) brings the greatest geniuses from time and space to her laboratory on the planet Lakertya so she can use their minds to power her time manipulator.

Whilst in flight, the TARDIS is attacked by the Rani, an amoral scientist and renegade Time Lord. The TARDIS crash-lands on the planet Lakertya. On the floor of the console room, the Sixth Doctor regenerates into the Seventh Doctor. In his post-regenerative confusion the Doctor is separated from Mel and tricked into assisting the Rani in her megalomaniac scheme to construct a giant time manipulator.

Lost on the barren surface of the planet, Mel has to avoid the Rani's ingenious traps and her monstrous, bat-like servants, the Tetraps. She joins forces with a rebel faction among the Lakertyans, desperate to end the Rani's control of their planet. The Doctor must recover his wits in time to avoid becoming a permanent part of the Rani's plan to collect the genius of the greatest scientific minds in the universe, of which she has captured many including Albert Einstein, in order that she can create a time manipulator, which would allow the Rani to control time anywhere in the universe, at the expense of all life on Lakertya.

The Doctor manages to foil her plan and free the Lakertyans of her evil control. The Rani escapes in her TARDIS, but it has been commandeered by the Tetraps, who take her prisoner. The Doctor takes all the captured geniuses on board his TARDIS so that he can return them home.

This story's working title was Strange Matter.^[2] The story was initially written for Colin Baker and the Sixth Doctor, with the opening scene, intended to be a depiction of the Judgement of Solomon, dropped to accommodate the regeneration.^[3]