During Kaz's second attempt to rescue H'earring, Chaor and the UnderWorlders plan to ambush the M'arrillians in a fiery trap involving Ulmar's Annihilizer near the oil-filled Marsh of Murk. Kaz ends up mind-controlled and Tom tries to rescue him while Sarah and Peyton look for a new battlegear called a Mindbander that can negate the hypnosis.