A calculating and ruthless antagonist who exploits supernatural artifacts to fuse with the Delightful Children, temporarily seizing control of the KND before being confronted by Numbuh 1 and Grim.
Billy's chaotic mistake creates the circumstances that Mandy turns into a power grab.
Billy's accidental destruction of the magical scythe triggers the crossover, while Mandy exploits the resulting supernatural crisis to take over the K...
Mandy's takeover places her in direct opposition to Grim.
Mandy temporarily seizes control of the KND before being confronted by Grim, who helps dismantle her takeover.
Explore the full interactive character relationship map of The Grim Adventures of the Kids Next Door