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The Flash -- "Tricksters" -- Image FLA117A_0104b -- Pictured: Mark Hamill as James Jesse -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0128b -- Pictured (L-R): Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0142b -- Pictured (L-R): Grant Gustin as Barry Allen, Jesse L. Martin as Detective Joe West, and Mark Hamill as James Jesse -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0163b -- Pictured: Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0198b -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0235b -- Pictured (L-R): Mark Hamill as James Jesse, Grant Gustin as Barry Allen, and Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0266b -- Pictured (L-R): Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0267b -- Pictured: Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0270b -- Pictured (L-R): Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0343b -- Pictured: John Wesley Shipp as Henry Allen -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0380b -- Pictured (L-R): John Wesley Shipp as Henry Allen and Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117A_0397b -- Pictured (L-R): Devon Graye as Trickster, John Wesley Shipp as Henry Allen, and Mark Hamill as James Jesse -- Photo: Diyah Pera/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117B_0034b -- Pictured (L-R): 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 -- "Tricksters" -- Image FLA117B_0081b -- Pictured: Grant Gustin as Barry Allen -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117B_0153b -- Pictured (L-R): 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 -- "Tricksters" -- Image FLA117B_0184b -- Pictured (L-R): Jesse L. Martin as Detective Joe West 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 -- "Tricksters" -- Image FLA117B_0300b -- Pictured: Grant Gustin as Barry Allen -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Tricksters" -- Image FLA117B_BTS_0342b -- Pictured: Behind the scenes with John Wesley Shipp as Henry Allen -- Photo: Cate Cameron/The CW -- © 2015 The CW Network, LLC. All rights reserved.