The Flash -- "There Will Be Blood" -- Image Number: FLA604a_0034b.jpg -- Pictured (L-R): Danielle Panabaker as Killer Frost and Carlos Valdes as Cisco Ramon -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604a_0077b.jpg -- Pictured: Hartley Sawyer as Dibney -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604a_0107b.jpg -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Grant Gustin as Barry Allen -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604a_0143b.jpg -- Pictured: Danielle Nicolet as Cecile Horton -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604a_0152b.jpg -- ictured: Grant Gustin as Barry Allen and Jesse L. Martin as Captain Joe West -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604b_0022b.jpg -- Pictured: Grant Gustin as The Flash -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604b_0025b.jpg -- Pictured: Grant Gustin as The Flash -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604b_0066b.jpg -- Pictured: Danielle Panabaker as Killer Frost -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved

The Flash -- "There Will Be Blood" -- Image Number: FLA604b_0078b.jpg -- Pictured: Jesse L. Martin as Captain Joe West -- Photo: Robert Falconer/The CW -- © 2019 The CW Network, LLC. All rights reserved