It's another Planet of the Apes/The Time Machine redux as a stuffy scientist (Peter Cushing) and a cowboy-inspired rich guy (Doug McClure) set off in an oversized drill/spaceship en route for the center of the earth. Of course, all kinds of creatures live there, namely large dodo-dinosaur hybrids, their monkey-pig underlings, and a humanoid race of slaves under their thumb. They even speak the Queen's English. While the fire effects are cool, the creatures are unilaterally awful. For 1976, an effects-driven film needs an awful lot more than plastic masks and stop-motion winking. Oh, and the script is lifeless, to boot.