Lady Serpent was a murderous female enemy of Black Terror who possessed hypnotic powers, owned several large and deadly snakes. Her weakness was her love of gems which she loved to steal. She managed to escape from jail two hours after Black Terror and Tim put her in there using her hypnosis. However, the Terror Twins set up a trap using her love for gems and return her to police custody. She escaped a second time but this time used her venomous snakes. She tried to take over a ship, but was once again defeated by Black Terror and Tim.