Steel Joker is a combo of Joker and Steel Serpent.
Davos Quinn was a former student of Master Raa's Al Khan who seeked to learn the move called "The Batfist", thinking he was the actual chosen one. He was obsessed with learning the move, and one day fell into a river polluted with toxic waste. This transformed him into a pale, crazy, green haired maniac. And when he found out Bruce Rand was the chosen one who could do the Batfist, he was jealous and kidnapped Bruce, forcing him to teach him the Vatfist. However, Bruce used the Batfist to defeat Davos and escape. However, Davos didn't give up on learning the Batfist, and now he is the super-villain known as Steel Joker!