A plane crash strands a trio of explorers on the rim of an ancient volcano. Kaänga and Ann offer assistance and they are all attacked by the Ka-winas, an ancient tribe determined to keep their home inside the volcano a secret. Kaänga uses the explorers' dynamite to ignite the volcano and destroy the Ka-winas and pushes the plane off the rim to glide to the jungle below. Kaänga and the explorers fly the plane into the Valley of Mist where they find Carthina, a lost Carthaginian outpost. Kaänga and his companions help restore the emperor to his throne after a coup by his daughter Portia.

Plot details indexed by the Grand Comics Database (CC BY-SA).