Season 4 (The Flash)

The Flash was renewed for a fourth season by The CW on January 8, 2017. It premiered on October 10, 2017. It took place in conjunction with the sixth season of Arrow, the third season of DC's Legends of Tomorrow, and the third season of Supergirl.

Main cast

 * Grant Gustin as Barry Allen/The Flash and Barry Allen
 * Candice Patton as Iris West
 * Danielle Panabaker as Dr. Caitlin Snow/Killer Frost
 * Carlos Valdes as Cisco Ramon/Vibe
 * Keiynan Lonsdale as Wally West/Kid Flash
 * Neil Sandilands as Professor Clifford DeVoe/The Thinker
 * Tom Cavanagh as Dr. Harrison "Harry" Wells, Harrison Wolfgang Wells, H. Lothario Wells, Wells 2.0, Wells the Grey, Eobard Thawne/Reverse-Flash, Sonny Wells, and H.P. Wells
 * Jesse L. Martin as Detective Joe West

Recurring Cast

 * Danielle Nicolet as District Attorney Cecille Horton
 * Mark Sweatman as Norvok
 * Kim Engelbrecht as Dr. Marlize DeVoe
 * Dominic Burgess as Ramsey Deacon/Kilg%re
 * Patrick Sabongui as Captain David Singh
 * Jessica Camacho as Cynthia/Gypsy
 * Donna Pescow as Dr. Sharon Finkel
 * Richard Brooks as Warden Gregory Wolfe
 * Sugar Lyn Beard as Becky Sharpe/Hazard and Professor Clifford DeVoe/The Thinker
 * Danny Trejo as Josh/Breacher
 * Hartley Sawyer as Ralph Dibny/Elongated Man and Professor Clifford DeVoe
 * Katee Sackhoff as Amunet Black
 * Chelsea Kurtz as Mina Chaytan/Black Bison
 * Kendrick Sampson as Dominic Lanse/Brainstorm and Professor Clifford DeVoe/The Thinker
 * Ryan Alexander McDonald as Neil Borman/Fallout
 * Bill Goldberg as David Ratchet
 * Jessica Parker Kennedy as Nora Allen II
 * Derek Mears as Sylbert Rundine/Dwarfstar
 * Paul McGillion as Earl Cox
 * Miranda MacDougall as Izzy Bowin/The Fiddler and Professor Clifford DeVoe/The Thinker
 * Leonardo Nam as Matthew Kim/Melting Point
 * Bethany Brown as Janet Petty/Null

Synopsis
"Running up against an evil time remnant version of yourself is something no one should ever have to do, but that’s exactly what faced Barry Allen (aka The Flash) as he fought to save the life of fiancée Iris West from the God of Speed known as Savitar."

"Barry’s victory was short-lived, however, as an unbalanced Speed Force began to wreak havoc on Central City, forcing Barry to sacrifice himself for the greater good."

"With The Fastest Man Alive now trapped inside an extra-dimensional energy, and unknown dangers lurking in the shadows, it will be up to Team Flash to free Barry from his own personal Hell."