WATCH: Mark Hamill's Santa Trickster Reveals Classic "Flash" Trap

The Trickster [Mark Hamill] and Weather Wizard [Liam McIntyre] share their nefarious holiday scheme with the Flash [Grant Gustin] in this new clip from the CW series' mid-season finale.

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Starring Gustin, Carlos Valdes and Jesse L. Martin, "The Flash" mid-season finale arrives Tuesday, Dec. 8 at 8 pm EST on The CW.

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