Season 2 (The Flash)

The Flash was renewed for a second season on January 11, 2015. It will begin airing October 6, 2015.

Main cast

 * Grant Gustin as Barry Allen/The Flash
 * Candice Patton as Iris West
 * Danielle Panabaker as Caitlin Snow/Killer Frost
 * Jesse L. Martin as Joe West
 * Tom Cavanagh as Harrison Wells
 * Carlos Valdes as Cisco Ramon/Vibe
 * Keiynan Lonsdale as Wally West
 * Tony Todd as Zoom

Recurring cast

 * Victor Garber as Martin Stein/Firestorm
 * Robbie Amell as Ronnie Raymond/Firestorm
 * Shantel VanSanten as Patty Spivot
 * Teddy Sears as Jay Garrick
 * Wentworth Miller as Leonard Snart
 * Malese Jow as Linda Park
 * Violett Beane as Jesse Quick

Synopsis
"Following the defeat of Barry Allen's arch-nemesis Eobard Thawne (aka Reverse Flash), Team Flash quickly turned their attention to the singularity swirling high above Central City, which fans last saw consuming everything in its path. Armed with the heart of a hero and the ability to move at super speeds, Barry charged into the eye of the singularity, but will he actually be able to save his city from impending doom?"

Confirmed plot points

 * There will be a crossover with Arrow ' s fourth season sometime in fall to winter.
 * The fate of Joe West's wife, and Iris West's mother, will be revealed.
 * Danielle Panabaker confirmed we will see Killer Frost sooner than we think.
 * More speedsters and villains will be introduced.
 * The show will explore the multiverse in this season.
 * This season will have a new main villain that will be introduced within the first few episodes.
 * Executive producer Andrew Kreisberg says that Cisco and Caitlin will be meta-humans, at least in some capacity.
 * The eighth episode, which will air sometime in December, will be one of the crossovers.
 * The premiere picks up a few months after the wormhole spiraled around Central City.
 * Ronnie will play a big role in Caitlin's development
 * Wally West is going to be a normal human, not a meta-human, in the beginning; furthermore, Wally will not appear in the first seven episodes.

New characters

 * Patty Spivot: A "spunky, fun and funny" romantic interest for Barry Allen. She is described as bright and scientific-minded — more specifically, "Think 'Felicity Smoak' from Arrow".
 * Olivia: A woman in her early 40's whose a troubled old friend of Joe's, who will be his love interest.
 * Jay Garrick: A man who suddenly appears to Central City to warn the STAR Labs crew.
 * Zoom: Faster than The Flash, and faster than Reverse-Flash. He’s going to be terrifying and scary and fast, and it’s gonna be really cool. He is so fast that everything around him, including even other speedsters, move slowly. He will appear within the first few episodes.
 * Wally West
 * Lewis Snart: Father of Leonard and Lisa, Lewis was "estranged and abusive," and is a cold-blooded, ruthless, career criminal.
 * Atom-Smasher: He will go to Central City to kill the Flash, and will be one of the most powerful villains encountered this season. Possessing incredible strength and the ability to grow to enormous sizes, Team Flash will have to come together to defeat him. He will appear in the premiere.
 * Jeremy Tell
 * Mirror Master
 * Doctor Alchemy
 * Carter Hall/Hawkman
 * Vandal Savage
 * Doctor Light: The meta-human will turn up this season on The Flash — but "it's going to be the female version" of the character.
 * Jesse Quick: A brilliant but quirky college student who gets caught up in the battle between The Flash and Zoom.

Trivia

 * Jay Garrick will appear in the second episode and will be working alongside Barry, and in the episode, Barry does something new with his speed. Grant says that Tom's character, whoever he is, will be from the multiverse.
 * Barry isn't wearing the new suit with the white emblem right-off, and is still using the old suit with the red emblem in the beginning of season two.
 * According to Danielle Panabaker, the seventh episode is going to be a monster of an episode.