In adjacent dimensions to each Earth within the Multiverse are variations of these spheres based on animals, not humans, as the predominant life form. For Earth-One, it was Earth-C home of the Zoo Crew. For Earth-Two, it was Earth-C minus home of Justa Lotta Animals. And for Earth-S, it was the home of a single superhero, and his six sources of sensational superpowers. Meet Marvel Bunny... or Captain Marvel Bunny, if you prefer.
Hoppy was Captain Marvel's biggest fan, reading all his comicbooks which chronicled his adventures through that medium, transmitted across the dimensional ether. Granted that powers of Salamander the wise, Hogules the strong, Antlers of stanima, Zebreus the powerful, Abalone the courageous and Monkury the fast.... Hoppy transforms into the World's Mightiest Bunny. Protecting his home Funny Animalville from threats such as Storm King and Captain Black Bunny, his legend would eventually draw him to his hero's homeworld to protect it from another beast, the beastman King Kull.
It was inevitable that the finest furballs of three animalverses would be drawn together as were Hoppy, Earth-C's Captain Carrot and Earth-C minus' Wonder Wabbit. Of course, the lads would be fighting over the lady's affections in the Land of Oz before all three teamed up before parting forever.
And thus, during these two occasions elsewhere, Marvel Bunny found the fellowship of fabulous friends with superpowers he didn't have in Animalville (since he never met Salamander and his pals during any of his recorded adventures, only the mysterious man who relayed their powers to Hoppy).