MaDall was a Zygerrian female who operated a small enslavement empire on the planet of Oon during the Age of the Empire. One day in 4 BBY, a new shipment of slaves collected all across the Lothal sector arrived, and MaDall chose one of her new acquisition, a Mandalorian called Sabine Wren, to become her personal servant. However, it turned out that Wren had willingly let herself be captured so she could free the Zygerrian's slaves. When she realized that Wren had deactivated her shock collar and taught the other slaves how to do it, MaDall confronted the Mandalorian, but she was defeated. Although MaDall feared that Wren and her friends would execute her for her crimes, she was allowed to go free. The Zygerrian felt that she had nothing left to live for, but Wren suggested she use her talents in fighting the Galactic Empire.
MaDall first appeared in "Return of the Slavers," a comic strip found in the fifth issue of the Star Wars Rebels Magazine. The design of MaDall was based on Miraj Scintel, a Zygerrian queen who first appeared in "Slaves of the Republic," the twelfth episode of the fourth season of Star Wars: The Clone Wars.