Dexter is a vintage DoALL model Koi pond maintenance robot. His weighted boots, high-suction filtration helmet and good rapport with carp make up for a bit of a stubborn streak. For example: while vacationing in Yellowstone he waded into a shallow sulfuric hot-spring which completely dissolved the bottom half of his aqua-bot coveralls. Rather than have them repaired, Dexter insists that the dip was intentional and that he prefers the freeing, "trouserless" look.