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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0011r.jpg -- Pictured (L-R): Jessica Parker Kennedy as Nora/XS, Candice Patton as Iris West - Allen and Jordan Fisher as Bart/Impulse -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0019r.jpg -- Pictured (L-R): Jordan Fisher as Bart/Impulse and Grant Gustin as Barry Allen/The Flash -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0026r.jpg -- Pictured (L-R): Jessica Parker Kennedy as Nora/XS, Candice Patton as Iris West - Allen and Jordan Fisher as Bart/Impulse -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0041r.jpg -- Pictured: Jordan Fisher as Bart/Impulse -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0042r.jpg -- Pictured (L-R): Jessica Parker Kennedy as Nora/XS, Candice Patton as Iris West - Allen and Grant Gustin as Barry Allen -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0043r.jpg -- Pictured: Grant Gustin as Barry Allen/The Flash -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0r.jpg -- Pictured (L-R): Jessica Parker Kennedy as Nora/XS -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0r.jpg -- Pictured (L-R): Jessica Parker Kennedy as Nora/XS -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved

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The Flash -- "Heart of the Matter, Part 1" -- Image Number: FLA717a_0085r.jpg -- Pictured (L-R): Jessica Parker Kennedy as Nora/XS, Candice Patton as Iris West - Allen and Grant Gustin as Barry Allen -- Photo: Bettina Strauss/The CW -- © 2021 The CW Network, LLC. All Rights Reserved