The greatest crossover of all time

Psychic: It is returning. It is returning through the dark and then, Doctor… oh but then… he will knock four times.

Doctor: Who? Who's going to kill me? Who is it that's knocking?

What do I watch tonight?

Withered, braindead creatures choking the vitality out of a once thriving world or The Walking Dead?

ETA: Even the well zombie wouldn't have snubbed Drive.