Cover pencils by Herb Trimpe, inks by John Severin. 

Umbu, the Unliving!, script by Stan Lee, pencils by Herb Trimpe, inks by John Severin; 

Ka-Zar and the Hulk battle as the jungle lord tries to figure out a way to get him to turn back into Bruce Banner in time to stop an alien machine from destroying the earth using deadly weather patterns; 

Ka-Zar is captured and taken by the Swamp Men to be a human sacrifice for the giant creature known as Umbu; 

Hulk fights Umbu but transforms back into Banner thanks to a fortuitous gas attack; 

Banner races to stop the mysterious earth destroying machine with Umbu close on his tail and trying to stop him; 

Banner succeeds but is killed in achieving his victory.