Prison Break alum Wentworth Miller is heading to Central City.

The Flash has booked Miller in the guest role of Leonard Snart, aka Captain Cold, on The CW's Arrow spinoff, executive producer Greg Berlanti announced Friday during the summer Television Critics Association press tour.

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Miller will first appear in the fourth episode.

In the DC Comics, the popular Leonard Snart/Captain Cold is a leader of the Rogues and considered an enemy of The Flash.

The Flash centers on Central City assistant police forensic investigator Barry Allen (Grant Gustin) who visits Starling City to look into a series of unexplained robberies that may have a connection to a tragedy in his past. Through a freak accident, he is given the power of superspeed, which transforms him into the fastest man alive.

Miller, repped by ICM Partners, joins a cast led by Gustin, Danielle Panabaker, Carlos Valdes, Jesse L. Martin, Candice Patton, Tom Cavanagh, Rick Cosnett and John Wesley Shipp in the ensemble, which also recently added Tomorrow People star Robbie Amell as half of Firestorm.

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Berlanti revealed that there is a good chance viewers will meet Dr. Martin Stein, the other half of Firestorm, revealing that in an early draft, Stein was "in a version of the pilot." (Among familiar faces appearing on The Flash are Arrow star Stephen Amell, who makes a cameo in the first episode.)

"We've incorporated almost everything from the mythology into it and added a whole new backstory," executive producer/chief creative officer of DC Comics Geoff Johns told reporters. "[The Flash] is probably the most faithful DC adaptation ever."

As for speculation over whether characters Green Arrow and The Flash will transition to the big screen, Johns tried to put that to rest, saying that the film and television universes for DC Comics "are separate worlds."

Berlanti also explained why producers opted to have Shipp play Barry's father, instead of Jay Garrick, which many fans had expected. It ultimately came down to the simple question of how to best capitalize on Shipp's presence. (He starred in the original CBS TV series and will recur on The Flash.) "What was the best way to use him the most?" Berlanti asked.

The Flash premieres Oct. 7 on The CW.

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