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The Flash -- "Escape From Earth-2" -- Image FLA214a_0089b -- Pictured: Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214a_0171b -- Pictured: Man in the Iron Mask -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214a_0277b -- Pictured (L-R): Zoom and Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_BTS_0022b -- Pictured: Behind the scenes with Grant Gustin as Earth 2 Barry Allen -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0025b -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0070b -- Pictured (L-R): Carlos Valdes as Cisco Ramon, Danielle Panabaker as Killer Frost and Candice Patton as Earth 2 Iris West -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0100b -- Pictured: Tom Cavanagh as Harrison Wells -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0113b -- Pictured: Grant Gustin as Earth 2 Barry Allen -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0122b -- Pictured: Tom Cavanagh as Harrison Wells -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0126b -- Pictured (L-R): Grant Gustin as Earth 2 Barry Allen and Candice Patton as Earth 2 Iris West -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0144b -- Pictured: Candice Patton as Earth 2 Iris West -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0160b -- Pictured (L-R): Candice Patton as Earth 2 Iris West and Danielle Panabaker as Killer Frost -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0203b -- Pictured (L-R): Candice Patton as Earth 2 Iris West and Grant Gustin as Earth 2 Barry Allen -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Escape From Earth-2" -- Image FLA214b_0224b -- Pictured (L-R): Danielle Panabaker as Killer Frost, Candice Patton as Earth 2 Iris West, Grant Gustin as Earth 2 Barry Allen, Carlos Valdes as Cisco Ramon, and Tom Cavanagh as Harrison Wells -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.