In this fifth episode of Corporate Film School we look at an essential element of film language, particularly in documentary, that, despite its snappy name, gets very little attention: B-Roll. We propose that, in fact, B-Roll is so elemental to filmmaking and yet so invisible in the discourse around it, that it is the Dark Matter of the film universe, holding everything together and determining the shape and texture of every film and video we watch. We also get to use this phrase, “like androids in some brightly-lit dystopia” which we feel has also been too rarely deployed in connection with Corporate Video.