In a series of new photos from "Running to Stand Still," the next episode of "The Flash," the Trickster (Mark Hamill) returns to Central City with a few friends. Wally West (Keiynan Lonsdale) also makes his debut just in time for Christmas, while Caitlin (Danielle Panabaker) and Jay (Teddy Sears) cozy up at a Team Flash party.

Starring Grant Gustin, Carlos Valdes and Jesse L. Martin, "The Flash" airs Tuesdays at 8 pm EST on The CW.