The newest trailer for the film dropped Wednesday. Joaquin Phoenix, who plays the Joker, is seen experiencing an emotional roller coaster as he is continually shot down by his peers. The climax of the preview shows a bunch of rioters in clown masks, seemingly showing their support for the Batman villain. Phoenix recently admitted that he was scared to take on the role. There was a lot of fear, yeah. But I always say there's motivating fear and debilitating fear. , Joaquin Phoenix, to 'Total Film'. There's the fear where you cannot make a f------ step, and there's the kind where it's like, 'OK, what do we do? That's not good enough.', Joaquin Phoenix, to 'Total Film'. 'Joker' hits theaters Oct. 4.