File:Stone knives and bear skins.jpg

Summary
Still from the Star Trek: The Original Series episode "The City on the Edge of Forever".

File was copied from https://www.dadsgamingaddiction.com/star-trek-the-original-series-the-city-on-the-edge-of-forever/ and then reduced to half size. Direct link: https://vincentpaone.files.wordpress.com/2011/11/thecityontheedgeofforeverhd612.jpg

Licensing
Copyright © 1967 Desilu Productions. This image's use here is believed to be fair dealing / fair use under copyright laws.