Snow Pack

S5 E19: When Icicle (KYLE SECOR) returns to enact the next phase of his devious plan, Caitlin and her mother, Dr. Carla Tannhauser (guest star SUSAN WALTERS), must resolve their long-combative relationship to defeat the icy monster. After Barry makes a big decision about their family without consulting her, Iris decides to take matters into her own hands.