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The Flash -- "Fallout" -- Image FLA114A_0083b -- Pictured: Robbie Amell as Ronnie / Firestorm and Danielle Panabaker as Caitlin Snow -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114A_0094b -- Pictured (L-R): Victor Garber as Professor Stein -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114A_0111b -- Pictured (L-R): Grant Gustin as Barry Allen / The Flash -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114A_0135b -- Pictured: Robbie Amell as Ronnie / Firestorm and Danielle Panabaker as Caitlin Snow -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114A_0159b -- Pictured (L-R): Grant Gustin as Barry Allen / The Flash -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114A_0207b -- Pictured (L-R): Grant Gustin as Barry Allen / The Flash, Robbie Amell as Ronnie / Firestorm, Danielle Panabaker as Caitlin Snow, and Victor Garber as Professor Stein -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114B_0017b -- Pictured (L-R): Isabella Hofmann as Clarissa, Victor Garber as Professor Stein, and Grant Gustin as Barry Allen -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114B_0026b -- Pictured (L-R): Victor Garber as Professor Stein and Grant Gustin as Barry Allen -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114B_0068bc -- Pictured (L-R): Victor Garber as Professor Stein and Isabella Hofmann as Clarissa -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114C_0070bc -- Pictured -- Photo: Dean Buscher/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114C_0108b -- Pictured: Clancy Brown as General Eiling -- Photo: Dean Buscher/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114C_0151b -- Pictured: Grant Gustin as Barry Allen / The Flash -- Photo: Dean Buscher/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114C_0226b -- Pictured: Grant Gustin as Barry Allen / The Flash -- Photo: Dean Buscher/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114C_0274b -- Pictured: Robbie Amell as Ronnie / Firestorm -- Photo: Dean Buscher/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Fallout" -- Image FLA114C_0275b -- Pictured: Robbie Amell as Ronnie / Firestorm -- Photo: Dean Buscher/The CW -- © 2015 The CW Network, LLC. All rights reserved.