Tomorrow night the midseason finale for “The Flash” midseason will be airing on the CW and it looks like the show is going to go out with a bang. Mark Hamill will be reprising his role as The Trickster and Wally West will be making his debut. The CW has released a new extended preview for the episode titled “Running to Stand Still” and you can check it out above along with a synopsis below.
MARK HAMILL, WENTWORTH MILLER AND LIAM MCINTYRE RETURN; KEIYNAN LONSDALE JOINS THE CAST AS WALLY WEST — When Mark Mardon AKA The Weather Wizard (guest star Liam McIntyre) returns to break Leonard Snart AKA Captain Cold (guest star Wentworth Miller) and James Jesse AKA The Trickster (guest star Mark Hamill) out of Iron Heights, Barry (Grant Gustin) must stop these rogues from taking over Central City during Christmas. Meanwhile, Joe (Jesse L. Martin) and Iris (Candice Patton) meet Wally West (Keiynan Lonsdale).
