Congo, a half-human primate hybrid transformed from his original simian form, embarks on a desperate quest to rescue his beloved Congette from her captors. Armed with agility and determination, he must navigate treacherous environments while managing his precarious state—any significant blow will regress him back into a helpless monkey. To overcome the odds, Congo can hunt down scattered rubies throughout his journey; gathering three of them grants him a temporary surge of extraordinary power, allowing him to tackle otherwise insurmountable obstacles and draw closer to his goal.