When stunt man Buddy Blake became irradiated with emissions from an unidentified flying object, he suddenly acquired the ability to absorb ambient attributes of animals around him. If a winged creature was nearby, he could fly. If a bestial behemoth was close at hand he gained its superhuman strength. While this transpired on Earth-One, a parallel even happened on Earth-Two when the heir to the title of Immortal Man himself gained superhuman strength, flight and other powers due to a meteor fragment from outer space. With Blake becoming Animal Man and his counterpart becoming Jungle Man, this pair defended two different continents from threats to nature, usually derived from that of selfish mankind. After five cases each, these two heroes retired only to reappear sparingly later.
Both men found true love in the form of Ellen Frazier for Blake and Helen Phelps for his cosmic twin. And each were tied to the Immortal Man, who himself journeyed from Earth-Two to Earth-One in order to recruit Animal Man into his team the Forgotten Heroes. This group only had a couple of adventures prior to the Crisis on Infinite Earths. And while Buddy and Ellen wed and had children, Jungle Man's true love Helen would be separated from him after his passing.
Perhaps the most tenacious adversary that the Immortal Man/Jungle Man faced was the plunderer known only as Karat who steals a mysterious helmet allowing him to create fantastic mutated animals in Africa. Karat's counterpart on Earth-One was Michael Maxwell, who while in Africa had himself been given a helmet by an intelligent red ape known as Djuba which allowed him to combine and control two animals into various variations of beasts. Taking the alter ego of B'wana Beast, Maxwell twice combated the evil Hamil Ali whose Earth-Two counterpart was Mister Ghool. Ghool was a recurring foe of Star-Spangled Kid and Stripesy, never having occasion to meet Jungle Man during that hero's brief career.