Scumbug, along with Muckman, Mutagen Man, and Wyrm, holds a high slot in the list of the most grotesque original Teenage Mutant Ninja Turtles action figures of all time.
Baxter Stockman, Scumbug was once a human, but through an accident of science became a freak of insect/human-hybrid nature.
Two things make Scumbug more grotesque than just his initial mutation, however.
First: he is a mutated cockroach (EVERYONE hates cockroaches - they're totally disgusting!) with all the sculpted details of a man in the midst of transmogrifying into a six foot tall Man-Roach! Blech!
Scumbug is a wonderfully disgusting TMNT figure indeed, and I love him for it!