"Ring Around The Riddler"
Riddler hopes to take control of all the prize-fighting in Gotham City with the help of Siren, who can hynotize men with her voice. To do this he disguises himself as the Middle Eastern champion, and goads Batman into fighting him in the ring.
When he steps into the ring with Riddler, Batman comments to Robin, "This is ridiculous. He's smaller than you are.