Get ready to ride the purple lightning, because The CW has released a promo for next week's episode of The Flash. Titled "Run, Iris, Run," the episode will see Iris West and Barry Allen switch roles when the former comes into possession of The Flash's super-speed powers.

The teaser wastes no time in showing Iris speeding into action, with a superhero costume of her own and a trail of purple lightning that instantly differentiates her from the show's other speedsters.

The switcheroo will be the work of a new meta villain by the name of Melting Pot, who has the ability to transfer people's DNA from one to the other. Finding himself without speed, Barry now has to settle into the role of sedentary team leader while Iris speeds into Central City as its newest superhero. But will she go by The Flash, or have a superhero name of her own?

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Airing Tuesdays at 8 p.m. ET/PT on The CW, The Flash stars Grant Gustin as Barry Allen, Carlos Valdes as Cisco Ramon, Danielle Panabaker as Caitlin Snow, Candice Patton as Iris West, Jesse L. Martin as Joe West, and Tom Cavanagh as Harry Wells, with guest appearances from Keiynan Lonsdale as Wally West and Hartley Sawyer as the Elongated Man.

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