The Flash has had one huge thing in common with all of the main villains through the show’s first three seasons. Zoom, Reverse Flash, and Savitar have all been speedsters, able to keep up and go toe-to-toe with Barry Allen.

But the showrunner says the fourth season will feature a unique Big Bad that won’t have super speed in common with the Flash’s previous foes.

Speaking at PaleyFest with cast and crew of the CW’s various superhero shoes, Andrew Kreisberg revealed one key aspect of the Flash’s fourth season: “Next season we’re not going to have a speedster,” he said.

That doesn’t mean there won’t be any Speed Force-possessed villains on the show, just that the main big bad won’t have that in common with the Flash. UP NEXT: ·The Flash, Supergirl Musical Crossover Details Reveal Characters' New Roles

But that’s next year, and Team Flash still has to get through this season. That’s building up to the inevitable, inescapable, and potentially fatal confrontation with Savitar. The latest supervillain to haunt Barry and Co. has been shown to kill Iris West in the future despite their many machinations to prevent the event. All the while, the mysterious speedster’s identity has remained a mystery. “With Savitar, we know who he is under there,” Kreisberg said. “We've been planning this for a while and we're really excited about it.”

The showrunner elaborated that the Flash’s first two seasons celebrated special abilities and what they mean, while this third year is focusing on the downside of powers. “That's the story we wanted to tell and that's why our version of Savitar is the perfect villain for that story.” They added that upcoming villain Abra Kadabra is a good foil for the season, as he’s from the future and claims to know Savitar’s identity. But he’ll only reveal the information if he’s released, after he’s captured earlier on.

“Iris and Barry have a great scene, 'Can you be a hero if you do one bad thing?’” The Flash’s crossover with Supergirl, “Duet” airs this Tuesday.

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DARREN CRISS (“GLEE”) GUEST STARS AS THE MUSIC MEISTER IN THE FLASH AND SUPERGIRL MUSICAL CROSSOVER – Barry (Grant Gustin) and team are surprised when Mon-El (guest star Chris Wood) and Hank Henshaw (guest star David Harewood) arrive on their Earth carrying a comatose Supergirl (guest star Melissa Benoist) who was whammied by the Music Meister (guest star Darren Criss). Unable to wake her up, they turn to Team Flash to save her.

However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can’t cure. Kara and Barry wake up without their powers in an alternate reality where life is like a musical and the only way to escape is by following the script, complete with singing and dancing, to the end. Dermott Downs directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Aaron Helbing & Todd Helbing (#317). Original airdate 3/21/2017.

[h/t] Mashable