10 Doctor Who Scenes You Didn't Realise Were Tricking You

10. Yana's Lab Equipment Was Designed To Look TARDIS-y (Utopia)

Utopia is one massive example of a Doctor Who story hiding something in plain sight. Only at its climax do we discover that the seemingly kind and gentle Professor Yana, brought to life so brilliantly by Sir Derek Jacobi, is none other than the Doctor’s nemesis, the Master.

The reveal (and the episode itself) still holds up incredibly well and has tremendous rewatch value, not least because of all the sly references to Yana’s true identity.

Most obviously, there’s his name, which doubles as an acronym for the phrase “You Are Not Alone” – the warning given to the Doctor by the dying Face of Boe.

But that’s not all.

On the web commentary for Utopia, supervising art director (and later Series 11 production designer) Arwel Jones let slip that there was another subtle clue hidden in the episode’s set design: namely, Yana’s laboratory, which, with its central computer banks and hanging wires, was meant to resemble the inside of the TARDIS.

Alas, Yana’s lab wasn’t an actual TARDIS – though the Master had been seen to own one in classic Who, and would acquire another one some time prior to Spyfall.