The CW has released an official description for the April 24 episode of The Flash which is called “Fury Rogue.” This episode is notable because it features the return of Citizen Cold as played by Wentworth Miller!
Here’s the description with some minor spoilers:
WENTWORTH MILLER RETURNS AS CITIZEN COLD — When Barry (Grant Gustin) needs help transporting a dangerous meta, he calls on a new friend for help – Leo Snart AKA Citizen Cold (guest star Wentworth Miller). Meanwhile, Cisco (Carlos Valdes) becomes suspicious of Harry (Tom Cavanagh). Rachel Talalay directed the episode written by Jeff Hersh & Joshua V. Gilbert (#419). Original airdate 4/24/2018.