Bogeyman (Space Babies)

A bogeyman was created in the year 21506 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 station and was made from the babies' snot. It was designed to have a roar with a frequency of 17Hz to instil fear in anyone who heard it, which made even the Fifteenth Doctor scared of it. After it terrorised Eric, Jocelyn Sancerre attempted to eject it from the ship through an airlock, but the Doctor saved it because he realised they were both the only ones of their respective species. It then remained in the air lock, functioning as the station's pet. (TV: Space Babies ^[+]Russell T Davies, Doctor Who series 14 (BBC One and Disney+, 2024).)