In the upcoming 3rd season of ‘The Flash‘ we are going to get some serious insight into why Caitlin Snow is how she is, because her mother is coming to the show. Today we have learned that Vampire Diaries alum Susan Walters has been cast to play the role of Dr. Carla Tannhauser, Caitlin’s mother. Are you excited to find out what Caitlin’s relationship with her mother is like? Let us know AFTER THE JUMP. The Flash returns with all new episodes on October 4th on the CW!