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The Flash -- "Finish Line" -- FLA323a_0193b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323b_0005b.jpg -- Pictured (L-R): Jesse L. Martin as Detective Joe West and Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323b_0026b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323b_0074b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323b_0155b.jpg -- Pictured (L-R): Jesse L. Martin as Detective Joe West and Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323b_0187b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323b_0205b.jpg -- Pictured: Tom Felton as Julian Albert -- Photo: Katie Yu /The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323c_0002.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Grant Gustin as Savitar -- Photo: The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323c_0003.jpg -- Pictured: Grant Gustin as Savitar -- Photo: The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323c_0026.jpg -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- "Finish Line" -- FLA323c_0028.jpg -- Pictured (L-R): Danielle Panabaker as Killer Frost and Carlos Valdes as Cisco Ramon -- Photo: The CW -- © 2017 The CW Network, LLC. All rights reserved.