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
 * 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
 * Jesse L. Martin as Detective Joe West

Recurring cast

 * Danielle Nicolet as District Attorney Cecile Horton
 * Kim Engelbrecht as "The Mechanic"
 * Patrick Sabongui as Captain David Singh
 * Jessica Camacho as Gypsy
 * Danny Trejo as "Breacher"
 * Hartley Sawyer as Ralph Dibny/Elongated Man
 * Katee Sackhoff as Amunet Black/Blacksmith
 * Anne Dudek as Tracy Brand

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.
 * A superhero from the DC Comics called Elongated Man will make a recurring appearance throughout this season.
 * Gypsy's father will be introduced.
 * Tom Cavanagh will direct at least one episode this season.
 * Tracy Brand will return at some point but she won’t be a full-fledged member of Team Flash.
 * Felicity Smoak will appear in the fifth episode.
 * Amunet Black/Blacksmith will make her first appearance in the same episode.
 * Ralph Dibny is a private investigator. He and Barry will not get along as they have this shared, checkered past.
 * He will make his first appearance in.
 * Wally West will return in Therefore I Am

Confirmed new characters

 * Ralph Dibny/Elongated Man: Ralph has the ability to stretch his body to super-human lengths and sizes... however, while resculpting his old body is easy to do, Dibny finds losing the old misguided sense of truth and slobbery, even after joining the team at S.T.A.R. Labs, is a far more difficult task to accomplish.
 * Breacher: Earth-19 bounty hunter Gypsy's imposing father. Also a feared bounty hunter, he seeks to prevent any inter-dimensional traveler from threatening life on his planet - especially his daughter's.
 * Amunet Black/Blacksmith: A steely and badass boss of an underground black market for supervillains. Amunet uses every means possible, including the long list of metahumans under her thumb, to ensure her illicit enterprise thrives.