Born William Tockman, the Clock King spends his early years taking care of his invalid sister. During one day, he finds out from a doctor's visit that he himself only has six months to live. Despairing for his sister's future, he watches the timing of a local bank's vault in order to rob it, hoping the money would provide for his sister after he was gone. His caper would have gone successfully, had he not tripped a silent alarm and been caught by the Green Arrow.