DC's Legends of Tomorrow -- "Crisis on Earth -- X, Part 4" -- Image Number: LGN308b_0075b.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow/Killer Frost, Melissa Benoist as Kara/Supergirl and Emily Bett Rickards as Felicity Smoak -- Photo: Robert Falconer/The CW -- é 2017 The CW Network, LLC. All Rights Reserved.