Francis Grimes' mother was "a shapeshifting mummy and kind of a bitch". She appeared in the episode "Mummy Dearest".

In the episode, she comes back from the dead. Grimes bribes his co-workers to pretend to be the boss of the Department of Integration to impress her.

However, Callie Maggotbone cannot stand the mummy and makes Grimes tell her the truth. His mother humiliates him and Grimes shoots her but it does not kill her. His mother calls forth her ancestors' army to occupy the DOI.

Even Callie and Leonard Powers's supernatural powers are no match for the mummy's. She tells Francis that he was a "naughty mistake with the gardener". In the end Grimes summons Anubis to send her back to her tomb.