Dr. H was featured in Episode 9: Plants are living things, too, Baby. He was one the Vegims from the northern hemisphere of Planet Planta. He worked as a scientist for Cocamuka, and later solely for his interests. He had a daughter, 033H.
Dr. H was a tall creature, towering over Dandy easily. His head resembles a hollowed out husk with a cavity filled with several pistil like eyes. A thick cone like stalk formed his body, ending with four appendages which fulfilled as his arms and legs. He has flaps on the sides of his cone like body, but they don't seem to do anything much except to permit him in additional microbe intake.
After Code D's inactivation, he shrunk back to an ordinary plant.