Midnight entity
From Tardis Wiki, the free Doctor Who reference
During the Crusader Tour to the Sapphire Waterfall, a strange monster attacked the tour bus. The monster knocked on the Shuttle and then possed Sky Silvestry and The Doctor, who both managed to escape from the possession. (DW: Midnight)
Behind the Scenes
Unique to Doctor Who, you didn't see the monster and the Doctor didn't defeat it, so it is still loose on Midnight.
