Editing AP Films (section)

==Century 21==
{{Further information|Century 21 Organisation}}
[[File:ITC Wikiproject - Century 21 production.jpg|thumb|Century 21 logo]]
Following completion of the first season of ''Thunderbirds'', AP Films was renamed Century 21 Productions to align it with its growing merchandising sister companies Century 21 Merchandising, Century 21 Toys, Century 21 Music,{{sfnp|Archer|Nicholls|1996|p=111|ps=}} and Century 21 Publications. In the second half of the 1960s, the company expanded its studios, increasing the number of filming stages to seven.<ref>{{Cite magazine|url=https://theasc.com/articles/thunderbirds|title=Behind the Scenes with Thunderbirds|magazine=[[American Cinematographer]]|date=November 1967|first1=George H.|last1=Sewell|url-status=live|archive-url=https://web.archive.org/web/20230209023750/https://theasc.com/articles/thunderbirds|archive-date=9 February 2023|access-date=30 March 2024}}</ref>

All Century 21's productions featured an opening ident of a field of pale concentric circles, which form a moving, off-centre tunnel against a blue background, into which flies a yellow dart which penetrates through a gap in the Century 21 logo already situated in front, at which point everything stops moving. This was accompanied by a typical [[Barry Gray]] string [[glissando]] and the caption "A Gerry Anderson Century 21 Television/Cinema Production" – the logo being part of that. This sequence was first used for the two ''Thunderbirds'' films that followed the series (''[[Thunderbirds Are Go]]''&nbsp;– premiering 12 December 1966{{sfnp|Archer|Nicholls|1996|p=117|ps=}}&nbsp;– and ''[[Thunderbird 6]]'' in 1968), and two more Supermarionation series for ATV, ''[[Captain Scarlet and the Mysterons]]'' (broadcast between 1967 and 1968) and ''[[Joe 90]]'' in (1968–69).{{sfnp|Archer|Nicholls|1996|pp=139–40|ps=}}

A live-action film, ''[[Doppelgänger (1969 film)|Doppelgänger]]'' (a.k.a. ''Journey to the Far Side of the Sun'') followed in 1969. That same year, Century 21 made its final puppet TV series, the rarely seen ''[[The Secret Service]]'' (which combined live action with puppetry), after which its puppet studios closed and its merchandising and publication subsidiaries contracted rapidly. Its first and only all-live action TV series, ''[[UFO (British TV series)|UFO]]'' (1970), proved to be its last production. Although a second series of ''UFO'' was planned, the project failed to progress beyond substantial pre-production work.