Cathy (voiced by Julie Klausner) is Aldermach Maggotbone's trusted assistant for over 35 years. She is first seen in the episode "Hell for the Holidays" where she validates Damek's parking ticket.

In the episode "Ride Me to Hell", Aldermach chooses her over Callie for replacement as the leader of Hell. However, she is shot by Francis Grimes before the ceremony is completed.