Thun'da, King of the Congo #1

Thun'da, the mighty warrior of a hidden lost world, encounters a princess fleeing from cliff people and leads her to safety while battling the cavemen who pursue them. When Russian agents seek to steal uranium from the Congo mines for atomic bombs, Thun'da confronts them and rescues an old man who reveals he saved a uranium shipment from capture. After defeating the Russians and their agents, Thun'da and the princess decide to make their home in the African jungle, embarking on further adventures together in this prehistoric world.