With the unparalleled success of the Teenage Mutant Ninja Turtles, including a popular television cartoon and two comic series, Archie Comics wanted to capitalize further. In the Spring of 1991, a mini-series was created starring several of the turtles’ most notable allies. So Dreadmon, Jagwar, Leatherhead, Mondo Gecko, Ray Fillet, Wingnut, and Screwloose became a new mutant hero team called the Mighty Mutanimals.

This new series marked the beginning of the “Megadeath” Arc, and was combined with the “Future Shark” trilogy of the TMNT comic to round out the Mutanimals’ story. Unfortunately, the writers felt the way to do this was to have the evil Gang of Four assassinate the members of the Mutanimals one by one, until no one remained, even though it happened during a time travel story, and everyone could have remained alive at the end. The creators wanted to set a particular tone for their characters, and avoid having these mutants become second string, forgotten to the annals of comic lore. (However, the deaths of Jagwar and Dreadmon were actually planned out well before the cancellation, and they were to be replaced with Slash and Metalhead.)
During their limited stories, the Mutanimals had several allies make appearances, beyond the ninja turtles and their rat master, Splinter. Other friends of the team included Mondo Gecko’s girlfriend, Candy Fine; Raphael’s special vixen lady friend, Ninjara; the evil turtle Slash; GlubLubs; Kid Terra; and Merdude. Of all these characters, Slash was the most notable, as he was supposed to be a Mutanimal. However, he too was killed off shortly after the Mutanimal massacre, leading to an even greater lasting impression of the team in TMNT lore.
The success that this new team was predicted to have led to Mirage Studios even creating a TV pitch in 1992. The new cartoon would see Ninjara added to the team as a female member, and the Mighty Mutanimals would battle Krang as he tried to take over the universe. The Teenage Mutant Ninja Turtles would have occasional guest appearances, but would stick to their own series so that these new mutants could have their day in the sun. While a character/animation bible was created, there was very little interest from Ruby-Spears Productions, and the pitch never became anything more than just that. While no one will ever know for sure, a television show may have been just what the Mighty Mutanimals needed to stay alive (with the TMNT audience already built in), both economically and literally.