Zygon spaceship (The Power of Three)
From Tardis Wiki, the free Doctor Who reference
On 26 June 1890, the Eleventh Doctor found that there was a Zygon spaceship beneath the Savoy Hotel, half the staff of which were impostors, when he took Amy Pond and Rory Williams to the hotel. Ultimately, the Doctor saw the the situation was "fixed". (TV: The Power of Three)
