Another mini-crossover works wonders and everyone finally gets caught up on the main mystery in a solid return to form.
Canadian promo trailer for the Flash episode Who Is Harrison Wells? featuring new spoilers.
Preview trailer for the Flash episode Who Is Harrison Wells?
Preview images for the Flash episode Who Is Harrison Wells? with Paul Blackthorne and Katie Cassidy from Arrow.
Official description for the April 21 episode of The Flash, titled Who Is Harrison Wells? and featuring guest stars from Arrow