A unicorn was a mythical beast similar in appearance to a horse, but with a single long horn in the middle of its head.
In the 1890s, Henry Gordon Jago joked that London would one day be invaded by killer unicorns. (AUDIO: The Backwards Men)
The Second Doctor encountered a unicorn in the Land of Fiction. (TV: The Mind Robber)
The Ceffyl of Tír na n-Óg resembled unicorns by design. (PROSE: Cat's Cradle: Witch Mark)
In 2002, unicorns appeared in San Francisco due to a dimensional scar. (PROSE: Unnatural History)
"The Unicorn" was the alias of Ada Mullins. (TV: The Unicorn and the Wasp)
The Bestiary of Legendary and Magical Creatures created a unicorn out of toilet paper. (PROSE: Phoenix)
Iris Wildthyme had a unicorn statuette in her TARDIS. (PROSE: Old Flames)
The Doctor once claimed that he was a unicorn. (PROSE: Borrowed Time)
Behind the scenes
- According to The Brilliant Book 2012, a book that contains non-narrative based information, in River Song's World unicorns were a pest in London, alongside Cyclops and Satyrs.