Season four's grim-as-f*ck "Metalhead" follows a woman as she struggles to survive in a dystopian setting all by herself, while bloodthirsty, dog-like robots track her across the barren countryside. The robots pop up in Bandersnatch on the posters for Colin's best-selling video game, which is stylised as "Metl Hedd." If you buy the theory that all the episodes in Black Mirror take place in the same universe, maybe the robots in Colin's game inspire someone to actually build them decades later.