A new clip has been released from tonight's episode of The Flash , and Harrison Wells is extremely concerned about Barry's trip back in time. Why? Well, it's all to do with the future and those mysterious red skies. We now have a clip featuring Captain Cold and Golden Glider!

CAPTAIN COLD AND HEAT WAVE RETURN TO CENTRAL CITY; PEYTON LIST GUEST STARS AS LISA SNART — The Flash (Grant Gustin) learns that Captain Cold (guest star Wentworth Miller) and Heat Wave (guest star Dominic Purcell) have returned to Central City. This time Snart has brought along his baby sister Lisa (guest star Peyton List) to help wreak havoc on the city. John Behring directed the episode with story by Grainne Godfree and teleplay by Brooke Eikmeier & Kai Yu Wu.

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