 A comic strip featuring the characters of Lady Penelope and Parker debuted in the early issues of APF Publishing 's children 's title TV Century 21 in 1965 . A full @-@ length Thunderbirds strip appeared a year later , at which point the Lady Penelope adventures were given their own comic . Thunderbirds , Lady Penelope and Captain Scarlet and Thunderbirds <unk> were published in the late 1960s ; during the same period , eight original novels were written . In 2008 , <unk> Publications of Minnesota launched a new series of tie @-@ in novels . 
