During an expedition to the African jungle, zoologist O'Hara (Bill Paxton Bill Paxton) is surprised to find a giant chimpanzee 15 feet long. to O'Hara 's surprise, the chimpanzee shows fear and hostility to strangers, but next to a girl named Jill (Charlize Theron Charlize Theron). The huge animal showed a gentle and dependent side, because Jill was his "friend" from childhood to big, and she called him "Joe". Unable to withstand O'Hara 's repeated persuasion and begging, Jill agreed to accompany Joe back to the United States, but O'Hara did so out of kindness and kindness, but unexpectedly caused a lot of trouble and put Joe in danger. Finally, unable to bear the life of being imprisoned, Joe dragged his huge body fifteen feet away.