Guess who's going to take center stage in "The Flash" season 3 episode 7? The upcoming installment is titled "Killer Frost," so that's actually a dead giveaway. According to the synopsis, Caitlin (Danielle Panabaker) is going to be very busy when she loses control and lets her inner Killer Frost take over.

A preview trailer shows her hurling icicles towards Cisco (Carlos Valdes), and he appears to be fighting back. She will also kidnap Julian (Tom Felton) and the CSI specialist doesn't sound too happy when he tells Barry/The Flash (Grant Gustin) that she's a "bloody menace."

As seen in the trailer, Caitlin will stick an icicle into Barry's leg or foot. So, that's got to hurt — physically and emotionally. Barry is trying to help his friend and he refuses to fight her. Well, he has to do something before things get worse.

"Heroes" alum Greg Grunberg is going to appear in the upcoming episode. He will be playing Tom Patterson, a detective at the Central City Police Department.

Killer Frost may be a threat, and Team Flash has been busy dealing with Doctor Alchemy (voiced by Tobin Bell). But fans are already wondering if Alchemy is just a henchman, while the big bad this season is Savitar.

Last August, executive producer Todd Helbing told IGN that Savitar is going to be different from the other speedster villains.

"Savitar is more of a psychological villain in a weird way. I think the Hindu word for Savitar means God of Speed; he's all about speed. Everything about this guy is different. I can't go into super detail, but he's not like Zoom [Teddy Sears] or Reverse-Flash [Matt Letscher]," he stated.

He does look different. The villain actually looks like something from one of Michael Bay's "Transformers" movies. At least the TV version of the character looks more menacing than its comic book counterpart.

Season 3 episode 7 of "The Flash" airs on Tuesday, Nov. 22, at 8 p.m. ET on The CW.