The CW has created "poster art" to promote the Flash season finale.
Preview clip for The Flash Season 3 finale which is called "Finish Line"
The CW has released official preview stills to promote the Flash season finale "Finish Line"
Screen captures from the trailer for The Flash Season 3 finale, titled "Finish Line"
Preview trailer for the Flash Season 3 finale which is called "Finish Line"
Official CW description for "Finish Line," the Season 3 finale for The Flash