In an attempt to beat Dash in a haunted house decorating contest, Danny "borrows" the enchanted sword of the Spirit of Halloween, the Fright Knight. When the evil, ghostly knight comes to retrieve his magic saber, he decides to stick around long enough to turn the real world into his own stormy realm of terror. Danny Phantom has other ideas, however, and tries to banish the Fright Knight back to the Ghost Zone. See the article on Fright Night on Fandom's Dannyphantom wiki.