By 1970 the British comics market was in a long-term decline, as comics lost popularity in the face of the rise of other popular pastimes for children. Initially, the challenge was the rising popularity of television, a trend which the introduction of colour television to Britain during 1969 set in stone. In an effort to counter the trend, many publishers switched the focus of their comics to television-related characters. The television shows of Gerry Anderson, such as "Thunderbirds" and "Captain Scarlet and the Mysterons", had begun this in the mid-1960s with the launch of tie-in comics such as "TV Century 21" and "Lady Penelope", which included strips related to Anderson's TV shows (as well as other popular programs of the era). Polystyle Publications already published a TV-related comic for young children called "TV Comic", and in 1971 moved into the older market with "Countdown" (later retitled "TV Action"). The teenage market saw "Look-in" magazine feature strips solely based on popular television programs.