Contemporary explorers are transported on a subterranean trek. Inspired by Jules Verne's novel. Chris: Jeffrey Nordling. Margo: Farrah Forke. Dr. Cecil Chalmers: John Neville. Briggs: Tim Russ. Dallas: Carel Struycken. Sandy: Fabiana Udenio. Wentworth: Francis Guinan. Prof. Harlech: F. Murray Abraham. William Dear directed.