Corporal Larry Grant and Sergeant "Mac" McGowan, of the United States Marine Corps, are rival for the love of Frances Schiller, but team up to hunt down "The Tiger Shark," a mad, scientific wizard who is holding Sergeant William Schiller, Frances' brother, a prisoner on a wild, jungle island in the Pacific.
Cpl. Larry Lawrernce
Sgt. Mack McGowan
Frances Schiller
Col. W. R. Bennett
Sgt. William Schiller [Chs. 1-4]
Capt. Grayson [Ch. 1]
Fake Native Chief [Ch. 12]
Kota
Metcalf
H.R. Douglas
M.J. Buchanan
Pedro
Gibson
Ivan
Miller
Karlsson