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.

Main cast

 * Grant Gustin as Barry Allen/The Flash and Barry Allen
 * Candice Patton as Iris West-Allen
 * 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 and Eobard Thawne/Reverse-Flash
 * 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 Wolfe
 * Sugar Lyn Beard as Becky Sharpe/Hazard
 * Danny Trejo as Josh/Breacher
 * Hartley Sawyer as Ralph Dibny/The Elongated Man
 * Katee Sackhoff as Amunet Black
 * Chelsea Kurtz as Mina Chaytan/Black Bison
 * Kendrick Sampson as Dominic Lanse/Brainstorm and Professor Clifford DeVoe
 * Bill Goldberg as David Ratchet
 * Derek Mears as Sylbert Rundine/Dwarfstar
 * Anne Dudek as Tracy Brand
 * TBA as Veronica Dale/Hyrax

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."

Confirmed plot points

 * Tracy Brand will return at some point but she won’t be a full-fledged member of Team Flash.
 * There will be a Cisco-Breacher story that doesn’t involve Gypsy.
 * This will be the last season of the Flash to feature Wentworth Miller as a version of Leonard Snart.
 * The theme of this season is Fastest Man Alive vs Fastest Mind Alive.
 * Veronica Dale/Hyrax will appear this season.
 * Keiynan Lonsdale will not return to the show and will join DC's Legends of Tomorrow as a series regular.
 * Iris will get a suit this season.
 * Kevin Smith will direct episode 17.

Confirmed new characters

 * Veronica Dale/Hyrax: An Environmental Activist (back when she was still sane) turned Animal Liberator turned Domestic Terrorist, who's the leader of the Eden Corps - a cult-like organization that proposes to turn back the clock to a pre-industrial age - and if millions of innocent people have to die in the process, well, that's just tough.
 * Jaco Birch: An obsessive music fanatic who worships at the altar of classic heavy metal.