Season 4 (The Flash)

The Flash was renewed for a fourth season by The CW on January 8, 2017. It will premiere on October 10, 2017.

Main cast

 * Grant Gustin as Barry Allen/The Flash
 * Candice Patton as Iris West
 * Danielle Panabaker as Dr. Caitlin Snow
 * Carlos Valdes as Cisco Ramon/Vibe
 * Keiynan Lonsdale as Wally West/Kid Flash/The Flash
 * Tom Felton as Julian Albert
 * Tom Cavanagh as TBA
 * Jesse L. Martin as Detective Joe West
 * Neil Sandilands as Clifford DeVoe/The Thinker

Recurring cast

 * Britne Oldford as Shawna Baez/Peek-a-Boo
 * TBA as Ralph Dibny/Elongated Man
 * Kim Engelbrecht as"The Mechanic"
 * Danny Trejo as "Breacher"

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

 * The main villain this season will not be a speedster.
 * The main villain will be DeVoe, who was mentioned in the previous season by Abra Kadabra and Savitar.
 * There will be a four-way crossover with Supergirl, DC's Legends of Tomorrow and Arrow.
 * The season premiere will take place 6 months after the Season 3 finale.
 * Iris will step into the role as the leader of Team Flash.
 * Wally will not take on the mantle of the Flash.
 * Kid Flash, Vibe and Joe will battle a samurai like villain at some point.
 * Wally will wear Barry's suit this season.
 * Shawna Baez/Peek-a-Boo will return this season.
 * A superhero from the DC Comics called Elongated Man will make an recurring appearance throughout this season.
 * A villian named The Mechanic will be a recurring character this season who builds devices for DeVoe.
 * Gypsy's father will be introduced.
 * Caitlin will return to the team this season.
 * The series will recover the lightness of the first season.
 * Tom Cavanagh has said that it is an option that he interprets a version of Johnny Quick in another Earth. This is another of the sprinters with whom Barry has crossed his ways and takes his powers from a mathematical formula.

Confirmed new characters

 * Clifford DeVoe/The Thinker: After being struck with dark matter from the particle accelerator explosion, Clifford DeVoe became a meta-human with a mega-mind. A Stephen Hawking-esque genius who’s devised an intricate plan to fix all that he deems wrong with humanity. “The Thinker” will embark upon a season long battle with The Flash that pins the “fastest man alive” against the “fastest mind alive.”
 * 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.
 * The Mechanic: An extremely intelligent engineer who will design devices for Clifford DeVoe. Basically, DeVoe’s right hand. She’ll support Devoe no matter the consequences.
 * 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.