Here’s the extended trailer for next week’s episode of The Flash, titled “Lose Yourself”, which features a conflict with the Thinker. It’s the eighteenth episode of the season, so there aren’t many left.
And this is the official synopsis for the episode, which should tell you more about it.
“Lose Yourself”- (8:00-9:00 p.m. ET)
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.