The Flash -- "Welcome to Earth-2" -- Image FLA213a_0397b -- Pictured: Danielle Panabaker as Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0482b -- Pictured: Danielle Panabaker as Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0137b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen, Candice Patton as Iris West and Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0220b.jpg -- Pictured (L-R): Danielle Panabaker as Killer Frost and Robbie Amell as Deathstorm -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0292b.jpg -- Pictured (L-R): Danielle Panabaker as Killer Frost and Robbie Amell as Deathstorm -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0301b.jpg -- Pictured (L-R): Danielle Panabaker as Killer Frost and Robbie Amell as Deathstorm -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0345b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0348b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0011b -- Pictured: Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0054b -- Pictured: Robbie Amell as Death Storm -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0078b -- Pictured (L-R): Candice Patton as Earth 2 Iris West and Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0085b -- Pictured: Candice Patton as Earth 2 Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0110b -- Pictured (L-R): Michael Rowe as Floyd Lawton, Candice Patton as Earth 2 Iris West, Carlos Valdes as Cisco Ramon, and Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0131b -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213a_0185b -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0005b -- Pictured: Jesse L. Martin as Earth 2 Joe West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0043b -- Pictured: Grant Gustin as Earth 2 Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserve.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0170b -- Pictured (L-R): Danielle Panabaker as Killer Frost and Robbie Amell as Death Storm -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0179b -- Pictured: Robbie Amell as Death Storm -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0260b -- Pictured (L-R): Candice Patton as Earth 2 Iris West, Grant Gustin as Earth 2 Barry Allen and Jesse L. Martin as Earth 2 Joe West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0282b -- Pictured: Danielle Panabaker as Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0341b -- Pictured: Jesse L. Martin as Earth 2 Joe West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- "Welcome to Earth-2" -- Image FLA213b_0379b -- Pictured: Candice Patton as Earth 2 Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved