Snow Pack

Synopsis
When Icicle returns to enact the next phase of his devious plan, Caitlin and her mother, Dr. Carla Tannhauser, 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.

Trivia

 * This episode title is named after a story arc/ team from the comics called "Mud Pack" made of all 4 Clayfaces at the time.
 * This is the fourth episode of this season not to feature.
 * The way Nora arrive in 2019 after exiting the Negative Speed Force is very similar to how Reverse-Flash returned in.