Mung is a beetlelike, hunchbacked alien who replaced HiTech as the second in command of Lord Dregg in the final season of the 87's TV TMNT series. Although he appears to be feeble and unprepared for combat - he was easily bested by both the Turtles and Shredder - Mung is known for his devious intelligence and skill in technology and engineering as he made incredible inventions which assisted Dregg in his plans for conquering Earth. One of his inventions was the Microbots, computerized nanobots which are capable of building anything Dregg wanted within only hours.
Over time, Mung and Dregg's alliance became strained, as Dregg became increasingly obsessed with defeating the Turtles, while Mung was more interested in conquering Earth. Eventually Dregg terminated their alliance, though not before blasting open a Microbot production machine and taking enough of the nanobots to create his ultimate weapon, the Morphogenesis Exoskeleton. Exactly what happened to Mung afterwards is unknown, though it's strongly implied that he may have been eaten alive by the Microbots freed by Dregg.