Bogeyman (Space Babies)
From Tardis Wiki, the free Doctor Who reference
A bogeyman was created by the parthenogenesis machine on Baby Station Beta to provide a being for the babies to be scared of when it started to take care of them. It lived on the lower levels of the ship and was made from the bogeys of the children. It roared at 17Hz which also made the Fifteenth Doctor scared of it. Jocelyn Sancerre tried to remove it from the ship via opening a air lock on it, but it was saved by the Doctor as they were both the last of their respective species. (TV: Space Babies [+]Loading...["Space Babies (TV story)"])