The exoskeletons are suits that the Utroms use to blend in with the humans. Invented by the Utroms using some parts of their ship. The Utrom Shredder stole an exoskeleton from a yellow Utrom to form his Shredder armor. Baxter Stockman used one to move about after Shredder reduced him to just his living head. He made the acquaintance of Leatherhead while wearing it. In Secret Origins, the exoskeleton are last seen, but later in Exodus, Part 2 Mortu and his crew have an exoskeleton. Cody Jones has an exoskeleton in his trophy room. In Wedding Bells and Bytes Mortu's crew have exoskeletons.