10 Doctor Who Easter Eggs Hidden In Plain Sight
How many of these did you catch?

With a history the predates the advent of colour television itself, Doctor Who has enough material to cram every single episode with decades-old easter eggs. But there's a fine line to walk between fan service and delivering something that suits the story with this show generally coming down on the former side, so Whovians are treated to them sparingly. Still though, with enough eggs to fill more than one list, it really becomes a choice of narrowing them down.
The Thirteenth Doctor's first season kept it light when it came to older material yet the twelfth season of the revival introduced a tonne of material to dissect and discuss. There are many, many nods to classic Doctor Who in the revived series overall, with almost every Doctor getting a look in at one point or another on this list.
Not every easter egg is as strong and not every entry relates to the Whoniverse alone. What is certain is that this will be far, far from the final list on the matter!
10. Star Trek Under The Lake

In the ninth season of the revival, the Twelfth Doctor and Clara arrive on The Drum, a mining facility off the Scottish coast in 2119. The episode is a creepy ghost story, full of tension, ghoulish lighting and properly engaging hauntings. There are plenty of mysteries etched in every wall, yet one of the most fun, albeit gruesome images, is the mural of the sea monster devouring some hapless sailors.
The sailors have a distinctive yellow, blue and red colouring - exactly the colours of the original Star Trek uniforms. Yellow, for command. Blue, for medical and science. Red, for target practice.
The fearsome-looking creature is devouring one unlucky soul, which does not bode particularly well for the Doctor and Clara, nor the inhabitants of the base. They escape behind a locked door, one which bears the number 1701. Again, anyone familiar with Star Trek will recognise this number instantly as the registry of the USS Enterprise - no bloody A, B, C or D!