Spillagers are a deadly species of sapient, extradimensional creatures. They act much like interdimensional viruses; moving from universe to universe and annihilating each one as they go. Their physical appearance is grotesque. They possess ventral slaying claws and are known to liquefy after death. They seem to be ruled by an Empress, and are aware of (and inimical towards) the Doctor.
- Big Finish Doctor Who audio stories - Winter for the Adept (2000)