Breacher

As previously mentioned, Danny Trejo (Machete, Sons of Anarchy) will be making an appearance on The Flash. He will be portraying Breacher, described as "a feared bounty hunter from Earth-19 and the imposing father to inter-dimensional bounty hunter, Gypsy (Jessica Camacho)."

With Gypsy joining the fold on Earth 1 - seemingly permanently - last season, it's safe to assume that she and her father will not be on the best of terms. Breacher's goal will reportedly be "to prevent any inter-dimensional traveler from threatening life on his planet — especially his daughter's." With that in mind, seeing Trejo go up against the members of Team Flash is sure to be a highlight of this season.

The Thinker

He's been teased for many episodes, and now we finally know his face. Neil Sandilands (The 100, The Americans) will be bringing the much-anticipated role of Clifford Devoe/The Thinker to life.

The season-long Big Bad is described as "a metahuman with a mega mind who embarks on a season-long battle with The Flash that pits the 'fastest man alive' against the 'fastest mind alive.'"

This is sure to provide a unique challenge for Team Flash, especially considering what's at stake. The Thinker has reportedly "devised an intricate plan to fix all that he deems wrong with humanity."

The Mechanic

The Thinker's sidekick, The Mechanic, will officially be joining the fold as well, and will be portrayed by Kim Engelbrecht (Dominion, Eye in the Sky). Described as "a highly intelligent engineer who designs devices for Devoe", she's "the truest of true believers who'll stop at nothing to help him implement his plan to fix humanity."

More The Flash News

The Flash's fourth season premieres on The CW on Tuesday, October 10th, at 8/7c.

Barry Allen (Grant Gustin) lived a normal life as a perpetually tardy C.S.I. in the Central City Police Department. Barry's life changed forever when the S.T.A.R. Labs Particle Accelerator exploded, creating a dark-matter lightning storm that struck Barry, bestowing him with super-speed and making him the fastest man alive — The Flash.

But when Barry used his extraordinary abilities to travel back in time and save his mother's life, he inadvertently created an alternate timeline known as Flashpoint; a phenomenon that gave birth to the villainous speed god known as Savitar, and changed the lives of Caitlin Snow (Danielle Panabaker) and Wally West (Keiynan Lonsdale) forever.

With the help of his adoptive father, Joe West (Jesse L. Martin), his lifelong best friend and love interest Iris West (Candice Patton), and his friends at S.T.A.R. Labs — Cisco Ramon (Carlos Valdes), C.S.I Julian Albert (Tom Felton), and an Earth-19 novelist named H.R. Wells (Tom Cavanaugh) — Barry continues to protect the people of Central City from the meta-humans that threaten it.

Based on the characters from DC, THE FLASH is from Bonanza Productions Inc. in association with Berlanti Productions and Warner Bros. Television, with executive producers Greg Berlanti ("Arrow," "Supergirl"), Andrew Kreisberg ("Arrow," "The Flash"), Sarah Schechter ("Arrow," "DC's Legends of Tomorrow") and Todd Helbing ("Black Sails").

More The Flash:

• The Flash Season 4 Set Photos Reveal Wally West in Flash Costume
• The Flash's Season 4 Premiere Will Feature A Season 1 Villain
• The Flash Speeds To The Rescue In Prime 1 Studio Statue
• Sterling Gates Joins The Flash's Season 4 Writing Staff