"Excaliferb" is an episode of Phineas and Ferb. During medieval times, Phineas and Ferb (or, Ferb-a-lot) set off on an epic quest to find the legendary sword, Excaliferb, so they can defeat the evil sorcerer, Malifishmirtz. Meanwhile, Candivere tries to get proof of their potions and accidentally uses them on herself.