Danielle Nicole Panabaker (born September 19, 1987) is an American actress. She began acting as a teenager and came to prominence for her roles in the Disney films Stuck in the Suburbs (2004), Sky High (2005) and Read It and Weep (2006), and in the HBO miniseries Empire Falls (2005). She won three Young Artist Awards: for guest-starring in an episode of the legal drama television series The Guardian (2004), for her lead role in the TV film Searching for David's Heart (2005) and for her ensemble performance in the family comedy film Yours, Mine & Ours (2005).
She came to wider attention as a cast member in the CBS legal drama series Shark (2006–2008) and is also noted as a scream queen, having starred in the psychological thriller Mr. Brooks (2007) and the horror films Friday the 13th (2009), The Crazies (2010), John Carpenter's The Ward (2010) and Piranha 3DD (2012).
After recurring roles on the drama series Necessary Roughness (2011–2013), the crime series Bones (2012–2013) and the crime drama Justified (2014), Panabaker guest-starred as Caitlin Snow on The CW television series Arrow in April 2014. The character was spun off into the main cast of The Flash which premiered that October. In the series' second season, Panabaker began playing the character's alter ego Killer Frost in different capacities in conjunction with her role as Snow. The role has led to subsequent guest appearances on Arrow and other Arrowverse series Supergirl and Legends of Tomorrow.