In "Revolution" Mad Mod used it to drain the youth from Robin, making him old and Moddie younger. Eventually, Robin reversed the effects and then broke it, ending King Moddie the First's reign over the city. Somehow, Mad Mod repaired the cane, and it reappeared after he was initiated into the Brotherhood of Evil. The cane also seems to grant Mad Mod transforming abilities, and this is shown clearly in the episode "Revolution", where he constantly switches his appearance. This however may be more of his illusion technology built into it.