I just stumbled across a documentary called "Filmed in Supermarionation" on Tubi. If you're of a certain age then you likely grew up watching shows like "Thunderbirds", "Captain Scarlet", and "Fireball XL5." All these shows came from the mind of Gerry Anderson, who later produced "Space 1999" and "UFO" in the '70s. The miniature effects used in those shows were developed in the earlier puppet shows and this doc follows the formation of the company that made those Supermarionation programmes and its development over the years.