Zabo Donalbain is Malcolm's brother, and his muscle. They met Greer Grant who worked for Dr. Tumolo, when Malcolm tried to create a slave army for himself. Greer became the superheroine The Cat, and caused Malcolm's death. Zabo escaped that confrontation, but he blamed Tigra for his brother's death. Only after Greer was turned into a furry heroine, was he able to find her. Tigra got help from Spider-Man, but she was able to convince Zabo to make peace with the past.