The performances transcend the film's tropes, grounding it in characters that feel more complete than this subgenre often produces.

if their story seems completely bonkers, almost like a feverish work of fiction, you ain't heard nothing yet.

It is a whirlwind of delight --- attractive actors, stunning couture, spectacular sets and outrageous parties.

I didn’t really have many expectations going into the movie (good or bad), but I actually really enjoyed it. I really liked the characters and the banter between them.

This one is an unusual contender for exploitation bookings in that it actually has a literate screenplay. In fact, the dialogue is far too convincing for cavemen (but that's another story). And it also carries a message that predates "Planet of the Apes". Roger Corman's direction is certainly efficient – the action scenes are convincingly staged – but lacks the imaginative flair he usually brings to these offerings. On the other hand, production values are reasonably impressive – even if we excuse a wobbly shot of dinosaurs and that all-too-familiar lizard fight footage from "One Million Years B.C." DeKova delivers a strong performance as the rabble- rousing heavy, while the heroine has just enough footage to look decorative – but not enough to slow down the action. Darah Marshall (in her only movie) certainly makes an attractive "blond maiden". Considering the heavy dialogue they have to handle, the rest of the players are fairly capable, although it's a bit of a shock to see Robert Shayne hiding behind a beard as the keeper of the flame. Vaughn is also not up to speed. He looks uncomfortable in his animal skin and his accent seems far too cultured for this setting. On the other hand, production credits, headed by Crosby's fine location photography, are rarely less than proficient.

Robert Vaughn (hair perfectly styled and all) plays a teenage caveman (duh) who questions why his tribe can't go in a certain part of the wilderness. Defying his elders him and a bunch of dumb friends go and discover a creature who can kill with its touch...I only caught this once at 11:30 at night on a local TV station. I realized it wasn't good but nonetheless had a fun time watching it. Seeing Vaughn so young and trying to make this silly script work was amusing. The other acting ranged from tolerable to God-awful. It was shot in two days--and looks it. I do admit there was a twist at the end that I didn't see coming and saves this movie from being a total fiasco. Basically this is only for Corman completists and Vaughn fans. Even Vaughn himself this was one of the worst movies ever made. I give it a 3.

Even dependable ace director Roger Corman wasn't able to turn this dud into something steadily worth watching. It stars THE MAN FROM UNCLE's Robert Vaughn as a 26-year-old "boy" who defies his tribe's law by daring to venture forth "beyond the river" to the other side, where he is met by quicksand and a few silly creatures. It's an hour or so of tedium, but we do get a hearty laugh in seeing Robert Shayne looking ridiculous as a bearded caveman in sheepskin and sporting a Shemp Howard haircut. The ending of the film is at least interesting, though it's not worth the trip to make it that far. * out of ****

I thought this film was actually pretty good. The writing is done well. It is very "B" rated, but don't let that tell you all about this film. The plot twists and turns and you will think you have the hang of it, then you won't. Please, take the time to see this, you may like it.