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 takes place in conjunction with the sixth season of Arrow, the third season of Supergirl, and the third season of DC's Legends of Tomorrow.

Main cast

 * Grant Gustin as Barry Allen/The Flash
 * 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 Clifford DeVoe/The Thinker
 * Tom Cavanagh as Dr. Harrison "Harry" Wells, Harrison Wolfgang Wells, H. Lothario Wells, Wells 2.0 and Wells the Grey
 * Jesse L. Martin as Detective Joe West

Recurring cast

 * Danielle Nicolet as District Attorney Cecille Horton
 * Mark Sweatman as Norvok
 * Kim Engelbrecht as Marlize DeVoe/The Mechanic
 * Jessica Camacho as Cynthia/Gypsy
 * Donna Pescow as Dr. Sharon Finkel
 * Danny Trejo as Josh/Breacher
 * Hartley Sawyer as Ralph Dibny/Elongated Man
 * Katee Sackhoff as Amunet Black/Blacksmith
 * Anne Dudek as Tracy Brand
 * TBA as Dominic Lanse/Brainstorm
 * TBA as Neil Borman/Fallout

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

 * There will be a four-way crossover with Supergirl, DC's Legends of Tomorrow and Arrow.
 * The crossover will take place over two-nights and will consist of 2 "two-hour miniseries". The first "two-hour miniseries" will consist of Supergirl and Arrow while the second one will consist of The Flash and DC’s Legends of Tomorrow.
 * The crossover will have high emotional stakes and emotional payoffs with romance in the air.
 * The title of the crossover is Crisis on Earth-X.
 * The live-action debut of The Ray will happen in the crossover.
 * Iris & Barry will get married in the crossover.
 * Tracy Brand will return at some point but she won’t be a full-fledged member of Team Flash.
 * Dominic Lanse/Brainstorm and Neil Borman/Fallout will appear this season.
 * Wally West will return in.
 * There will be a Cisco-Breacher story that doesn’t involve Gypsy.
 * Gypsy will return in episode 9.
 * Warden Wolfe will be a recurring character throughout the season.
 * This will be the last season of The Flash to feature Wentworth Miller as Leonard Snart/Captain Cold.

Confirmed new characters

 * Dominic Lanse/Brainstorm: African American. A gregarious and good-natured meta-human who has the ability to read minds. His gift becomes a curse when criminal forces capture Dominic and want him to use his powers for evil.
 * Neil Borman/Fallout: A blue collar, likable, good guy just trying to make ends meet, but unbeknownst to him, he has radiation emitting meta powers that could cause the whole city to suffer a nuclear, catastrophic explosion. Neil is unaware that he is hurting people.