The Flash -- "Fury Rogue" -- Image Number: FLA419a_0003b.jpg -- Pictured (L-R): Katie Cassidy as Siren -- X and Ryan Alexander McDonald as Neil Borman/Fallout -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0450b.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow and Jesse L. Martin as Detective Joe West -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0045b.jpg -- Pictured (L-R): Katie Cassidy as Siren -- X, Danielle Panabaker as Caitlin Snow. Ryan Alexander McDonald as Neil Borman/Fallout and Jesse L. Martin as Detective Joe West -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0050b.jpg -- Pictured (L-R): Katie Cassidy as Siren -- X and Ryan Alexander McDonald as Neil Borman/Fallout -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0095b.jpg -- Pictured (L-R): Wentworth Miller as Leo -- X/Citizen Cold and Grant Gustin as The Flash -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0102b.jpg -- Pictured: Wentworth Miller as Leo -- X/Citizen Cold -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0169b.jpg -- Pictured (L-R): Wentworth Miller as Leo -- X/Citizen Cold and Grant Gustin as The Flash -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419a_0247b.jpg -- Pictured: Wentworth Miller as Leo -- X/Citizen Cold -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419b_0416b.jpg -- Pictured: Grant Gustin as The Flash -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419b_0491b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Wentworth Miller as Leo -- X/Citizen Cold -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419b_0507b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Wentworth Miller as Leo -- X/Citizen Cold -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419b_0550b.jpg -- Pictured: Danielle Panabaker as Caitlin Snow -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved

The Flash -- "Fury Rogue" -- Image Number: FLA419b_0555b.jpg -- Pictured: Danielle Panabaker as Caitlin Snow and Candice Patton as Iris West -- Photo: Shane Harvey/The CW -- © 2018 The CW Network, LLC. All rights reserved