Anthony Burgess created the primitive language for the early humans in this prehistoric adventure about a trio of warriors who travel the savanna, encountering sabre-toothed tigers, mammoths and cannibalistic tribes in search of a flame that would replace the fire their tribe has lost. - Keith Loh, IMDb
This is quite a fascinating film, giving us an insight into the problems facing the need for fire and existence as a whole. There is in fact more than just a rear shot of a boy in the tribe, for there is one scene where a young boy is seen naked and full frontal with one of his arms missing. If you find a copy, it is well worth watching for its primitiver atmosphere.
Peter Pan is alive and well, but which Peter Pan, I hear you ask?