Barry Allen puts another stamp on his speedster passport in this exclusive sneak peek from The Flash‘s fall finale.

In “The Present” (airing tonight at 8/7c), Barry is unable to focus on the Christmas holiday, and especially his relationship with Iris, so he travels to Earth-Three — why are there always Zeppelins? — to get advice from Jay Garrick (guest star John Wesley Shipp).

In the clip above, Barry arrives just in time to help his fellow Flash tussle with that Earth’s Trickster (played by Mark Hamill, whose make-up this go-round evokes the unmasked Darth Vader, amiright…?). Barry then reveals to Jay his specific mission. Press play above to see what it is.

Elsewhere in the episode, Wally irks Barry with a confession, while Cisco faces his first Christmas without his brother Dante, reopening fresh wounds.

Want scoop on Flash, or for any other show? Email insideline@tvline.com and your question may be answered via Matt’s Inside Line.