Captain Cold and Heat Wave return to Central City with Snart’s sister, blackmailing Cisco into making them new weapons. Meanwhile Barry reveals to Dr. Wells that he has traveled in time, but cannot convince Iris that she has feelings for him.

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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.