Tenet is finally here, and in cinemas. Christoper Nolan's latest is a big budget time-recalibrating spy-ish sci-fi thriller that's almost impossible to talk about. Almost. Nimbly dancing around spoilers the best they can, here are the cast of Tenet - John David Washington, Elizabeth Debicki, Robert Pattinson and Sir Kenneth Branagh - as well as Nolan himself.