Doctor Who: Flux - 15 Huge Details We Just Learned About Series 13
14. Space Dog Is One Of The First Aliens We Meet
Speaking of The Halloween Apocalypse, space dog - officially known as Karvanista, but space dog is a lot more fun to say - will debut in that episode.
The series actually kicks off with the Doctor hunting him down, indicating that he might be an antagonist - despite his cute, furry appearance.
Oh, and according to Mandip Gill, the actor inside that dog suit is over six feet tall, meaning that Whobacca will tower over everyone he shares the screen with.