Tarzan and Numela, Jad-bal-ja's mate, stumble into a city of lost Portuguese colonists as they search for Numela's cub.; When Boy saves his life, M'Bula gives Boy one of his hunting dogs. The dog becomes lonely for its previous master and litter mate and Tarzan and Boy return the dog to M'Bula.; The brothers rescue their queens from the forces besieging M'tembo.