Mr. Harrison's Sword was an aged Sword that professor of medieval history Mr. Harrison had borrowed from a local museum. He was writing a book about the sword, thinking it might be the legendary Excalibur. Eventually Ellie borrowed the sword to help her friend William Wagner. Handing the sword to Will during his face-off with his step-brother Marco, the blade transformed and Will won their duel.
- Despite Mr. Harrison's theory, the sword is in fact not Excalibur.