For the first time ever on Blu-Ray in the UK comes this 50s Sci-Fi monster classic featuring Terrifying monsters from a lost age . This Dual-Format release features the HD 16x9 transfer on the Blu-Ray as well as the original 4x3 SD presentation on the DVD.On an archaeological dig in Asia, Dr. Roger Bentley (John Agar - Tarantula) finds a cuneiform tablet referring to an ancient society, the Shadow Dynasty, that was destroyed. An earthquake soon after reveals an ancient artifact and the scientists discover the ruins of an ancient temple world on a remote mountain site. It leads them to an underground world, lost in time, where people have adapted to low light. The High Priest Elinu (Alan Napier - Julius Ceasar) doesn't welcome the presence of the new arrivals and wants them eliminated.