It's not a spoiler to learn that "The Flash's" Jay Garrick (John Wesley Shipp) will join Barry Allen (Grant Gustin) in the latter's fight against Savitar, but there's still something comforting to actually see and hear Jay Garrick pledge to help Barry Allen in his battle against the purported god of speed.

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In addition to executive producer Todd Helbing setting the table for the two Flashes' inevitable clash with the newly revealed super-speedster, the video also reveals that Earth-19 -- where HR Wells (Tom Cavanagh) hails from -- celebrates Christmas in much the same way as Earth-1. As HB puts it, "some traditions are multiversal."

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BARRY SEEKS HELP FROM JAY GARRICK — With Alchemy and Savitar still looming threats, Barry (Grant Gustin) is unable to focus on the Christmas holiday, and especially his relationship with Iris (Candice Patton). Determined to stop Savitar, Barry goes to Earth-3 to get advice from Jay Garrick (guest star John Wesley Shipp). Wally (Keiynan Lonsdale) wants to help Barry fight Savitar and reveals that he’s been training with H.R. (Tom Cavanagh), which doesn’t go over well with Barry. As Cisco (Carlos Valdes) faces his first Christmas without his brother Dante (guest star Nicholas Gonzalez), old wounds are reopened. Rachel Talalay directed the episode with story by Aaron Helbing & Todd Helbing and teleplay by Lauren Certo (#309). Original airdate 12/6/2016.

Starring Grant Gustin as the Scarlet Speedster, "The Flash" airs Tuesdays at 8 pm ET/PT on The CW. The series also stars Jesse L. Martin, Tom Cavanagh, Carlos Valdes, Candice Patton, Danielle Panabaker, Keiynan Lonsdale and more.