(2 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0070b.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow/Killer Frost and Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(3 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0086b.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow/Killer Frost and Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(4 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0121b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(5 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0136b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen, Carlos Valdes as Cisco Ramon, Jesse L. Martin as Detective Joe West, Tom Cavanagh as Harrison Wells and Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(6 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0169b.jpg -- Pictured (L-R): Tom Cavanagh as Harrison Wells and Candice Patton as Iris West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(7 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0253b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(8 of 16)

The Flash -- "Killer Frost" -- Image FLA307a_0261b.jpg -- Pictured: Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(9 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0006b.jpg -- Pictured: Tom Felton as Julian Albert -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(10 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0010b.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow/Killer Frost and Tom Felton as Julian Albert -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(11 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0024b.jpg -- Pictured: Danielle Panabaker as Caitlin Snow/Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(12 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0086b.jpg -- Pictured: Danielle Panabaker as Caitlin Snow/Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(13 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0148b.jpg -- Pictured (L-R): Tom Felton as Julian Albert and Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(14 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0214b.jpg -- Pictured (L-R): Tom Felton as Julian Albert and Danielle Panabaker as Caitlin Snow/Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(15 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0220b.jpg -- Pictured (L-R): Grant Gustin as The Flash and Danielle Panabaker as Caitlin Snow/Killer Frost -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.

(16 of 16)

The Flash -- "Killer Frost" -- Image FLA307b_0276b.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow/Killer Frost and Grant Gustin as The Flash -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All rights reserved.