Thunderbirds is a British mid-1960s television show devised by Gerry and Sylvia Anderson and made by AP Films using a form of marionette puppetry dubbed "Supermarionation". The series followed the adventures of International Rescue, an organisation created to help those in grave danger using technically advanced equipment and machinery. The series focused on the head of the organisation, ex-astronaut Jeff Tracy, and his five sons who piloted the "Thunderbird" machines. A popular show, the series is still shown today and has inspired a number of subsequent television programmes and films.