Running to Stand Still

"Running to Stand Still" is the first Christmas-themed episode of The Flash. It aired during the show's second season on December 8, 2015.

Synopsis
When Mark Mardon AKA The Weather Wizard returns to break Leonard Snart AKA Captain Cold and James Jesse AKA The Trickster out of Iron Heights, Barry must stop these rogues from taking over Central City during Christmas. Meanwhile, Joe and Iris meet Wally West.