Towards the end of the film , Sterns is exposed to some substance that begins his transformation into Leader .
Tim Blake Nelson as Samuel Sterns : The cellular biologist who develops a possible antidote to Banner 's condition .
Towards the end of the film , Samuel Sterns is exposed to some substance that begins Banner 's transformation into Leader .
Tim Blake Nelson as Samuel Sterns : The cellular biologist who develops a possible antidote to Banner 's condition .