Killer Frost is set to make a big entrance on the show.
The villain, who is played by Caitlin Snow regular Danielle Panabaker, makes an spine-chilling arrival in Central City - boasting that she's having fun being bad, reported Digital Spy.
The news comes after it was previously announced that "The Flash" is bringing back one of Barry Allen's archenemies for a rematch in the New Year.
Matt Letscher has been tapped to reprise his role as Eobard Thawne, when the villain seems to rise from the grave in episode 11.
"The Flash" returns in January.