It was not known who wrote "The Adventures of James Bond Junior 003½", although many authors have been named as possibilities, including Roald Dahl and Kingsley Amis. Amis was usually seen as unlikely since a year later he released "Colonel Sun" under the pseudonym Robert Markham; however, unlike R. D. Mascott, Amis's authoring of "Colonel Sun" was never a secret. Amis's writing style was also not similar to Mascott. Roald Dahl, on the other hand, did share some similarities, specifically with one book he wrote in 1975, "Danny, the Champion of the World". Dahl completed the screenplay for "You Only Live Twice" for Eon Productions in 1967, the same year "The Adventures of James Bond Junior 003½" was published. Although there was evidence to suggest Dahl may have written "003½", there was equally as much evidence to suggest he had not.