Penfold's formidable aunt from Abergavenny, Wales, who sends him cookies in the episode, "The Statue of Liberty Caper". The fact that she is Welsh is stated by the piece of a witch's broom in "The Four Tasks of Danger Mouse". The broom is her fifth cousin. She denies that Danger Mouse is a real secret agent and says that he and Penfold are just playing silly pretend games.
The character has not - as of May 2016 - appeared in the reboot.