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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0013b -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0178b -- Pictured: Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0180b -- 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.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0312b -- Pictured (L-R): Candice Patton as Iris West and Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0319b -- Pictured (L-R): Shantel Van Santen as Detective Patty Spivot and Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0333b -- Pictured (L-R): Jesse L. Martin as Detective Joe West, Grant Gustin as Barry Allen and Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0353b -- Pictured (L-R): Shantel Van Santen as Detective Patty Spivot and Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0414b -- Pictured: Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0418b -- Pictured (L-R): Candice Patton as Iris West and Keiynan Lonsdale as Wally West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211a_0429b -- Pictured: Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0017b -- Pictured (L-R): Amanda Pays as Christina McGee and Matthew Letscher as Eobard Thawne/Reverse Flash -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0028b -- Pictured (L-R): Amanda Pays as Christina McGee and Matthew Letscher as Eobard Thawne/Reverse Flash -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0063b -- Pictured: Grant Gustin as The Flash -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0066b -- Pictured (L-R): Grant Gustin as The Flash and Amanda Pays as Christina McGee -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0076b -- Pictured: Grant Gustin as The Flash -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0091b -- Pictured: Grant Gustin as The Flash -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0152b -- Pictured (L-R): Matthew Letscher as Eobard Thawne/Reverse Flash, Grant Gustin as The Flash, and Amanda Pays as Christina McGee -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0174b -- Pictured (L-R): Grant Gustin as The Flash and Amanda Pays as Christina McGee -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "The Reverse Flash Returns" -- Image FLA211b_0188b -- Pictured (L-R): Grant Gustin as The Flash and Amanda Pays as Christina McGee -- Photo: Bettina Strauss/The CW -- © 2016 The CW Network, LLC. All rights reserved.