Transported to Barsoom, a Civil War vet discovers a barren planet seemingly inhabited by 12-foot tall barbarians. Finding himself prisoner of these creatures, he escapes, only to encounter Woola and a princess in desperate need of a savior.

Sergeant Hoover went to war to preserve the Union. After being captured and sent to a prisoner of war camp, he understood what it was to be kept against his will. Together with a friend he escaped and, aided by slaves, made it to freedom.