The Flash 3×16 “Into the Speed Force” Season 3 Episode 16 Sneak Peek – BARRY TURNS TO THE SPEED FORCE – Desperate to stop Savitar and save his friends, Barry (Grant Gustin) turns to the speed force for answers. H.R. (Tom Cavanagh) gives Jesse (guest star Violett Beane) some advice. Gregory Smith directed the episode written by Brooke Roberts & Judalina Neira (#316). Original airdate 3/14/2017.