"Flash" Winter Finale Teases Wally West Debut, Trickster & Captain Cold

After battling Zoom in last week's episode and heading for a showdown with Vandal Savage in the upcoming "Flash"/"Arrow" two-night crossover, Barry Allen (Grant Gustin) needs to take care of some local Central City business before he gets a break for the holidays.

In "The Flash," winter finale, Weather Wizard (Liam McIntyre) returns to break both Captain Cold (Wentworth Miller) and the Trickster (Mark Hamill) out of prison. With the Trickster and Captain Cold on the loose, it's sure to be a white -- and potentially deadly -- Christmas in Central City.

Iris West (Candice Patton) and her father Joe West (Jesse L. Martin) also come face to face with Joe's long lost son, the famous comic book speedster, Wally West (Keiynan Lonsdale).

"Running to Stand Still," the winter finale of "The Flash," airs at 8 p.m. on Tuesday, December 8 on The CW. The full synopsis for the episode is 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).  Kevin Tancharoen directed the episode written by Andrew Kreisberg (#209).

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