• Stephen Amell and Grant Gustin play the title roles in the TV series "Arrow" and "The Flash," respectively.

Stephen Amell and Grant Gustin play the title roles in the TV series "Arrow" and "The Flash," respectively. (Photo : Facebook/The Flash)

Danielle Panabaker has been playing Dr. Caitlin Snow in The CW series "The Flash" since 2014. Recently, the actress talked about the character, a highly intelligent bioengineering expert named after the civilian identity of the DC Comics character Killer Frost, and what makes her terrified of Zoom, who is voiced by Tony Todd.

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"If Zoom kills your partner, would you really be that quick to defy him?" Entertainment Weekly quoted Panabaker as saying. "I'm not sure that she's going to be their best source of assistance. It's tough for her."

Panabaker pointed out that Zoom is scary to everyone, even to each villain working for him as he does not have "any qualms about killing anyone who angers him, which makes him even scarier." The actress added that Zoom is "no one to be messed with" and it continues to terrify Killer Frost.

Earlier this month, Panabaker talked about the circumstances under which Barry and company encounters Killer Frost for the first time. In an interview with TV Line, the actress said her character and Gustin's character "lock eyes on each other in an unexpected situation."

"When Barry Allen first comes across Killer Frost, I don't think he's expecting to see what Earth-Two's Caitlin Snow looks like," Panabaker told the publication. She added that Barry and Cisco Ramon/Reverb (Carlos Valdes) are both "pretty shocked."

In addition, Panabaker described Caitlyn's relationship with Ronnie Raymond/Deathstorm (Robbie Amell) as "a little bit more Bonnie and Clyde." She pointed out that Caitlyn and Ronnie love each other the same as on Earth-One and they still have the same amount of passion.

In "The Flash" Season 2 episode 15 titled "King Shark," which airs on The CW on Feb. 23, the episode title role voiced by David Hayter will attack Joe West (Jesse L. Martin), Iris West (Candice Patton), Wally West (Keiynan Lonsdale) and Barry Allen/The Flash (Grant Gustin). Prior to this, Lyla Michaels (Audrey Marie Anderson) and John Diggle (David Ramsey) will travel to Central City to warn The Flash about the news that King Shark had escaped from an A.R.G.U.S. holding tank.

Watch a clip from episode 14 titled "Escape from Earth-2" here: