This thrilling serial, loosely based on the Jules Verne novel, follows a band of Civil War POWs who escape by balloon and land on the uncharted title isle. There they encounter pirates, volcano-worshipping natives, an alien scientist from Mercury and her crew, and an unknown ally. Richard Crane, Karen Randle, Marshall Reed, and Gene Roth star. 15 chapters; 4 1/4 hrs. Standard; Soundtrack: English Dolby Digital stereo.