Agu was a giant ape that lived in the Congo jungle during the 20th century. The creature's origins, and how it grew to such a massive size, is unknown. Agu was feared by the animals and the various tribes that lived in the jungles during the 1950s. Agu soon encountered the adventurer known as Lorna the Jungle Queen early on in her career. Lorna realized that the ape only attacked when threatened and came to consider the creature her friend. When Agu stopped by a nearby river to drink, he was attacked by the Itibi tribe who feared the massive primate. Fighting back, Agu knocked back a flaming arrow into the Itibi village setting it ablaze, frightening the ape into fleeing into the jungle with Itibi warriors on his heels. The Itibi warriors were stopped by Lorna who showed them that the creature only attacked when provoked and allowed it to go free.