As the clock counts down the final hours before Savitar kills Iris, Barry turns to Captain Cold for help stealing an alien power source from an ARGUS facility — one last-ditch effort to stop the enemy.

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THE COUNTDOWN BEGINS; WENTWORTH MILLER RETURNS AS CAPTAIN COLD

With only 24 hours left until Savitar murders Iris (Candice Patton), Barry (Grant Gustin) struggles to save the woman he loves and makes the choice to use any means necessary to do so. Realizing he has one option left to save her, The Flash turns to Captain Cold (Wentworth Miller) for help.

Michael Allowitz directed the episode with story by Andrew Kreisberg and teleplay by Grainne Godfree (#322).