Watch The Flash S1E19 Full Episode Online for Free in HD @ br br Air Date : October 7th, 2014 br Season Number : 1 br Episode Number : 19 br Episode Name : Who Is Harrison Wells? br Guest Stars : Katie Cassidy, Stephen Amell br Networks : The CW br Genres : Action, Adventure, Drama, Science Fiction br br Storyline: br Joe and Cisco head to Starling City to continue their investigation of Dr. Wells. While in town, the duo enlists the help of Captain Lance, and Cisco meets the Black Canary, who asks him for a favor. Meanwhile, back in Central City, Barry races to catch a meta-human named Hannibal Bates who can transform himself into every person he touches – which includes Eddie, Iris, Caitlin and even The Flash. br br Casts: br Tom Cavanagh, Jesse L.