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The Flash -- " Untouchable" -- Image FLA312a_0044b.jpg -- Pictured: Tom Felton as Julian Albert -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- Image FLA312a_0067b.jpg -- Pictured (L-R): Candice Patton as Iris West and Danielle Panabaker as Caitlin Snow -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- Image FLA312a_0085b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen, Candice Patton as Iris West and Danielle Panabaker as Caitlin Snow -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- Image FLA312a_0099b.jpg -- Pictured (L-R): Candice Patton as Iris West and Danielle Panabaker as Caitlin Snow -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312a_0141b.jpg -- Pictured: Danielle Panabaker as Caitlin Snow -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312a_0158b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Candice Patton as Iris West -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312b_0007b.jpg -- Pictured (L-R): Grant Gustin as The Flash and Keiynan Lonsdale as Kid Flash -- Photo: Bettina Strauss/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312b_0024b.jpg -- Pictured (L-R): Grant Gustin as The Flash and Keiynan Lonsdale as Kid Flash -- Photo: Bettina Strauss/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312b_0041b.jpg -- Pictured (L-R): Grant Gustin as The Flash and Keiynan Lonsdale as Kid Flash -- Photo: Bettina Strauss/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312b_0049b.jpg -- Pictured (L-R): Grant Gustin as The Flash and Keiynan Lonsdale as Kid Flash -- Photo: Bettina Strauss/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312b_0209b.jpg -- Pictured (L-R): Jesse L. Martin as Detective Joe West, and Grant Gustin as Barry Allen -- Photo: Bettina Strauss/The CW -- © 2017 The CW Network, LLC. All rights reserved.

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The Flash -- " Untouchable" -- FLA312b_0215b.jpg -- Pictured (L-R): Jesse L. Martin as Detective Joe West, Tom Felton as Julian Albert and Grant Gustin as Barry Allen -- Photo: Bettina Strauss/The CW -- © 2017 The CW Network, LLC. All rights reserved.