Caitlin Snow’s “frosty” mother (see what we did there?) will be making an appearance in season three of The Flash, played by Susan Walters, who played Caroline Forbes’ mum Carol in the first four seasons of The Vampire Diaries.
According to Entertainment Weekly, Snow’s mother will be called Carla Tannhäuser, a “world class biomedical engineer and CEO of a major research company.” The season two episode “Back To Normal” revealed that Snow has an “icy” relationship with her mom (sorry); that episode also revealed she has an estranged brother but there’s no news about whether we’ll be getting to meet him too. Apparently Carla thinks her daughter is “rebellious and ungrateful”.
As far as we can tell, Carla Tannhäuser is not a character from the DC comics world, but the Arrowverse has a habit of introducing characters with different names that hide their more famous alter egos. Then again, you’d hope Caitlin would be suspicious if her mother has suddenly changed her name from Diana Prince or Pamela Isley.