A Set of trading cards were issued with bubble gum by A&BC gum in the UK during 1967. A series of 45 cards was produced, each card had a colour photograph from the first episode and the cards backs if read in the correct order told the story of that episode. A coded message was on the bottom of each card, which could be decoded by means of a small decoder that also came with the gum. Each card was approx. 55mm x 80mm in size.