While there, he will encounter a very familiar face in the Trickster, again played by Mark Hamill.
Shipp and Hamill have a long history fighting on-screen together, as they both starred in the 1990s The Flash TV show, as Allen and the Trickster respectively.
Ahead of the episode’s premiere, The CW released a sneak peek of Earth-3’s Trickster – one which may give some viewers deja vu.
[SPOILERS for those not caught up on The Flash ahead!]