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The Flash -- "Back to Normal" -- Image: FLA219a_0034b.jpg -- Pictured: Candice Patton as Iris West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219a_0076b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219a_0085b.jpg -- Pictured (L-R): Jesse L. Martin as Detective Joe West, Carlos Valdes as Cisco Ramon and Grant Gustin as Barry Allen-- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219a_0087b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219a_0108b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Carlos Valdes as Cisco Ramon -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219b_0004b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219b_0036b.jpg -- Pictured (L-R): Grant Gustin as The Flash, Carlos Valdes as Cisco Ramon and Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219b_0077b.jpg -- Pictured Grant Gustin as The Flash -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219b_0110b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

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The Flash -- "Back to Normal" -- Image: FLA219b_0131b.jpg -- Pictured: Grant Gustin as The Flash -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.