The Mutanimals were co-founded by Old Hob and Slash. Hob used a supply of mutagen to create Pete, but deemed him inadequate, so he recruited Lindsey Baker to help him create Herman and Mondo Gecko and to properly use Splinter's mutagenic blood to give Slash normal intelligence. From here, the Mutanimals were formally organized with the goal of protecting vulnerable mutants from exploitation and harm.
The Mutanimals came into conflict with Null's Null Group. In an assault on Jillian Amante's lab, they rescued Mutagen Man and brought him into their group. Soon after, they freed the Null Group's surviving mutants, Sally Pride and Ray, from a Null Group train at a rail yard in New Jersey. The Mutanimals and Null reached a stalemate, unable to completely defeat each other, but the Mutanimals succeeded in derailing the Null Group's mutant experimentation projects by applying enough sabotage and blackmail to make them unworkable.
After Splinter became the new leader of the Foot Clan, Michelangelo left his father and brothers, wanting nothing to do with the Foot as an organization. In issue 52, Mondo Gecko tracked down Mikey, and in issue 53, Mikey was welcomed into the larger Mighty Mutanimals as their newest member. He took part in one of the Mutanimals operations before stumbling over Hob's secret. After this, both Mikey and Slash left the Mutanimals; Mondo, Sally, and Seymour lost some of their confidence in Hob; and Mikey earned Hob's renewed enmity. Mikey offered Slash a new home, but Slash decided he needed to be on his own and learn what it's like to be the master of his own life, and the two tearfully parted ways. While Slash and Hun are still enemies, Slash remains on good terms with Hob, the other Mutanimals and Mikey.
Leader:
Old Hob
Members:
Herman the Hermit Crab
Man Ray
Sally Pride
Mondo Gecko
Mutagen Man
Pigeon Pete
Supporting Cast:
Lindsey Baker
Allies:
Dreadmon
Clan Hamato
Former Members:
Slash
Michelangelo
Villains:
Null
Agent Bishop
Villainous Groups:
Null Group
Earth Protection Force
