Barry Allen will head into the Speed Force during Tuesday’s episode of The Flash — but will he return?

Desperate to save Wally’s (Keiynan Lonsdale) life after he was trapped in the Speed Force by Savitar, Barry (Grant Gustin) returns to what’s basically an extra-dimensional energy that gives speedsters their powers with every intention of taking Kid Flash’s place.

“Barry was so busy trying to save Iris he didn’t realize it was Wally he should have been protecting,” executive producer Andrew Kreisberg tells EW. “That’s going to lead Barry to risk everything to go into the Speed Force to get him back, but someone always has to be trapped in the Speed Force prison. So the question in that episode becomes: Is Barry going to sacrifice himself for Wally, and how are they going to get Wally out?”

The answer to the former: If Barry has his way, yes. “He’s willing to make the ultimate sacrifice when he enters the Speed Force,” Gustin says. “Barry is willing and wants to stay and replace Wally in the Speed Force forever. He thinks it’s what he deserves, to spend the rest of eternity in the Speed Force.”

The Flash - Into the Speed Force
Credit: Robert Falconer/The CW

While “Into the Speed Force” serves as a semi-sequel to last season’s Kevin Smith-directed episode “The Runaway Dinosaur,” this trip into the Speed Force will be very different. If Barry’s last journey there was like going to heaven — in which the entity took on the form of friendly faces like Joe (Jesse L. Martin), Iris (Candice Patton), and his parents Henry (John Wesley Shipp) and Nora (Michelle Harrison) — this time around, it’s more like going to hell. Barry will be facing those he feels like he’s failed, including Ronnie (Robbie Amell) and Eddie (Rick Cosnett).

“The Speed Force takes a little bit more of an aggressive approach with Barry just because of choices that have been made since the end of season 2 leading up to where we’re at now,” Gustin says. “They use different characters that will get under Barry’s skin in a different way, but also they’re just not quite as understanding anymore because of how many decisions Barry has made that have affected time and affected the timeline. So it’s a pretty different Speed Force experience than last year.”

Into the Speed Force
Credit: Diyah Pera/The CW

Get more scoop on what’s in store for Barry’s trip into the Speed Force here.

The Flash airs Tuesdays at 8 p.m. ET on The CW.

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After the success of Arrow, Barry Allen (a.k.a. The Flash) gets his own CW treatment in this comic-themed spin-off.

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