Things are really starting to heat up on The Flash and next Tuesday, the team makes their most dangerous move yet when they find a way to infiltrate The Thinker's pocket dimension. With their options limited and the clock ticking down, the Scarlet Speedster (Grant Gustin) will take Killer Frost (Danielle Panabaker) and Vibe (Carlos Valdes) with him on a potential suicide mission.



However, while those three are off trying to get an upper hand on DeVoe, it looks like Team DeVoe will be doing a little infiltrating of his own as these new promotional stills reveal both DeVoe (Miranda MacDougall) and Marlize (Kim Engelbrecht) inside S.T.A.R. Labs, which is certainly not good news for Ralph (Hartley Sawyer) and Iris (Candice Patton), who were tasked with protecting the homefront.



The new photos also reveal that the episode will introduce one of the last two remaining bus metas, Edwin Gauss (Arturo Del Puerto), a.k.a. the Folded Man, who doesn't seem to have gone full supervillain yet as we see him having a seemingly pleasant conversation with Ralph.



Check out nineteen new promotional stills and the extended promo for episode eighteen, titled "Lose Yourself," below:

"Lose Yourself" - (8:00-9:00 p.m. ET) (TV-PG, LV) (HDTV)



RALPH CONSIDERS CROSSING A LINE TO DEFEAT THE THINKER - When Barry (Grant Gustin) and Team Flash find a way to enter The Thinker's lair, Ralph (guest star Hartley Sawyer) considers crossing a dangerous line to defeat DeVoe. Meanwhile, Joe (Jesse L. Martin) is concerned by Harry's (Tom Cavanagh) recent behavior. Hanelle Culpepper directed the episode written by Jonathan Butler & Gabriel Garza (#418). Original airdate 4/17/2018.

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The Flash -- "Lose Yourself" -- Image Number: FLA418a_0019b.jpg -- Pictured (L-R): Hartley Sawyer as Dibney and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2018 The CW Network, LLC. All rights reserved