Barry feels guilty for what happened to Caitlin; Mark comes up with a plan that makes everyone skeptical; Red Death looms in Central City and commands that failure is not an option; old friends pay an unexpected visit to S.T.A.R. Labs.
Stars: Grant Gustin, Candice Patton, Danielle Panabaker
Director(s): Eric Wallace
Writer(s): Greg Berlanti, Andrew Kreisberg, Geoff Johns