TV21 was a British science fiction magazine that first appeared in 1965. It was published by Polystyle Publications and primarily focused on the popular television series Thunderbirds, created by Gerry Anderson. The magazine featured comic strips, articles, and illustrations related to the show and other science fiction themes. The publication ran until 1969, producing a total of 66 issues. TV21 became well-known for its vibrant artwork and engaging stories, appealing to fans of puppet animation and science fiction. It played a significant role in promoting the Supermarionation genre and remains a nostalgic piece of British pop culture.