Emerald was the Joker's henchwoman in the season 3 episode The Joker's Flying Saucer.
Biography[]
Emerald was one of the Joker's gang members for his flying saucer plan. She was sent to steal Beryllium metal to complete his flying saucer.
While stealing the Beryllium, she along with her fellow henchmen, capture Alfred and Batgirl. After Joker failed to launch Batgirl on a rocket, he and his gang took Alfred and Batgirl on board the flying saucer and took off, but Batman and Robin sent the saucer back to the Joker's hideout, and defeat the Joker and his gang.