Sickle with his brother called Hammer were born as conjoined twins. Their father left them at circus, where they rised as brusiers. Joker and Harley Quinn wanted them in their own gang. However, he wanted them separated, sho Joker hired Dr. Tohams Elliot to perform the operation. After operation Joker left Sickle at the Iceberg Lounge as a gift for the Penguin. When they met later, they give up on gangs a wanted just stay together.