Seven-foot-tall Eegah the prehistoric caveman (Richard Kiel) is out on the prowl in his desert domain when Roxy (Marilyn Manning) runs him down with her sporty little roadster. The brute survives, but he's soon holding both Roxy and her father captive in his lair. It's up to Roxy's boyfriend Tom (Arch Hall Jr.), a gas station attendant who moonlights as a rock 'n' roller, to subdue the rampaging man-beast. What Tom doesn't bargain for is Eegah's extreme interest in stealing his girl!