Watch Mr. Mercedes Season 1 Episode 3 Online. Best and Free Online streaming for Mr. Mercedes TV Show. We picked the best sites to stream s01e03. Simply pick a site below and click "Watch Now!" button next to it. Some of the links may be broken, please upvote the working and good links so other users see those links for Mr. Mercedes Season 1 Episode 3 s01e03 at the top of the list.