The undaunted trio fly on malagors to the City of Thark, inhabited by a hundred thousand green warriors over whom Tars Tarkas ruled. An army of green men mounted on thoats ride toward Helium at dawn of the following day led by Tars Tarkas himself. John and Dejah ride above them on a malagor. Helium Pew attacks Helium with all of his forces. Kantos Kan has taken the bait, so the fleet of Helium is gone, but a messenger has been sent on a malagor to bring them back.
White apes fly over the city on their malagor dropping bombs on the nearly defenseless people.
The next morning, the green men lead a desperate charge upon the city to save what might be left of it, when at the same moment the fleet of Helium appears. The green men on thoats have to fight the flying white apes as the fleet draws near, but just as it seems that they might be saved Joog appears holding a huge tree trunk in his mighty hand. In a steel howdah strapped to the top of Joog's helmet rides Pew Mogel. Twenty of Helium's ships are downed by a single blow of the giant. The fleet regroups and spreads out to fight the giant, but his rapidly regenerating tissue is not affected by even thousands of bullet or ray wounds.