The Mighty Mutanimals!
The Mighty Mutanimals are a groups of, well, mutant animals that have all sorts of weird space adventures saving the world while flying around in a giant talking cow's head and stuff like that there. The team in the comics included two characters that never made it to toy form: Jagwar, a Brazilian Jaguar-man, and Dreadmon, a Jamaican wolf-man. The team also consists of the four individuals you see above, who did make it to toy form during the classic TMNT Playmates action figure run.
I've had most of these guys in my TMNT collection for some time now, but after reading their mad-cap adventures I wanted to get the whole gang together (or at least all the gang that made it to toy form!)
Goodwill Hunting for Geeks finally netted him for me (get it? Netted - Because he's a fish!?!? HAHAH!
Well there you have it, my Mighty Mutanimal collection. If you want to read a bit more about the Mighty Mutanimals and how they nearly became a cartoon, check out TMNT Entity's blog post, which includes proposed animation designs and some cool looking villains and vehicles that would no doubt have eventually become toys had the cartoon come into existence.