He’s credited as “Unseen Arkham Prisoner” in the cast listing, but it’s clear that he’s playing The Joker. In the scene, Barry begins talking with Riddler after he’s thrown in Arkham.

This 52-card deck is designed to match what’s in the game, and includes the standard Joker, Juggler, Blueprint, and Gros Michel for its joker cards. The designs printed on the 52 linen-finished ...