Watch DC's Legends of Tomorrow Season 4 Episode 15 Online. Best and Free Online streaming for DC's Legends of Tomorrow TV Show. We picked the best sites to stream s04e15. 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 DC's Legends of Tomorrow Season 4 Episode 15 s04e15 at the top of the list.