The CW released preview images for The Flash episode "Present" featuring Mark Hamill back as Trickster and John Wesley Shipp as Jay Garrick.
As noted, Mark Hamill looks a lot like a version of Joker.
Episode synopsis:
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.
"The Flash" airs Tuesdays at 8pm ET on The CW starring Grant Gustin as Barry Allen/The Flash, Candice Patton as Iris West, Panabaker as Caitlin Snow, Carlos Valdes as Cisco Ramon, Keiynan Lonsdale as Wally West, Tom Cavanagh as Dr. Harrison Wells and Jesse L. Martin plays Joe West.
