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Upon his release from Arkham, the Riddler becomes an instant celebrity with his own line of toys and games. Soon he's rich, well-liked and happy, except for the fact that he's never managed to best Batman in a battle of wits. Realizing that he's still obsessed with beating the Dark Knight and that the obsession will lead to his downfall, the Riddler lures Batman into a death-trap puzzle to get rid of his opponent and end the riddle games.
This is the last Riddler-centered episode of the series. Paul Dini has since revealed that the reason for the limited number of Riddler episodes is that he was the most difficult character to write for, given that in the comic the Riddler's plots go could on for issues on end whereas they have only twenty minutes in a cartoon episode. As a result, the production team has a bin filled with rejected Riddler scripts that proved too complicated or too silly to do.
Riddler: Hello, Batman. This is it: the end of the game. I'm a little sad actually. You were a worthy opponent but then I told you I'd make a killing at the Toy Fair!
Riddler: That's all in the past. Ancient history that's gone now. I'm a new man, but you probably won't figure that out until it's too late.