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The Flash -- "The Darkness and the Light" -- Image FLA205A_0063b.jpg -- Pictured (L-R): Shantel VanSanten as Patty Spivot and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0087b.jpg -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0124b.jpg -- Pictured (L-R): Ciara Renee as Kendra Saunders and Carlos Valdes as Cisco Ramon -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0167b.jpg -- Pictured (L-R): Carlos Valdes as Cisco Ramon, Grant Gustin as Barry Allen and Danielle Panabaker as Caitlin Snow -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0229b.jpg -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0242b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0294b.jpg -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Ciara Renee as Kendra Saunders -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0001b2.jpg -- Pictured (L-R): Candice Patton as Iris West, Shantel VanSanten as Patty Spivot and Jesse L. Martin as Detective Joe West -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0019b.jpg -- Pictured (L-R): Candice Patton as Iris West, Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0053b.jpg -- Pictured: Malese Jow as Linda Park -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0090b.jpg -- Pictured (L-R): Tom Butler as Eric Larkin, Malese Jow as Linda Park and Candice Patton as Iris West -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0103b.jpg -- Pictured (L-R): Malese Jow as Linda Park and Candice Patton as Iris West -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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he Flash -- "The Darkness and the Light" -- Image FLA205B_0109b.jpg -- Pictured: Malese Jow as Linda Park -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0131b.jpg -- Pictured (L-R): Malese Jow as Linda Park and Candice Patton as Iris West -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0140b.jpg -- Pictured (L-R): Malese Jow as Linda Park and Candice Patton as Iris West -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205B_0306b.jpg -- Pictured: Teddy Sears as Jay Garrick -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "The Darkness and the Light" -- Image FLA205A_0285b.jpg -- Pictured: Tom Cavanagh as Harrison Wells -- Photo: Katie Yu/The CW -- © 2015 The CW Network, LLC. All rights reserved.