Avsnitt 4

Arthur's loyal magician, Merlin, has discovered a potion which makes the person you give it to fall head-over-heals in love with you. Arthur plans to catapult the potion at Guinevere so she'll finally marry him, but he accidentally hits her chaperon, Petal . He asks Merlin for an antidote, but is told that a few special ingredients are needed, a feather from the confused back wards flying owl and a single hair from the maine of the invisible unicorn, so Arthur sets out to find these whilst trying to avoid Petal who now wants to marry the King.