By Christmas 1971, interest in Thunderbirds had sadly started to decline hence very few were printed in comparison with previous issues, making this annual the most sought after by collectors. Ownership of the copyright had moved to Polystyle, who returned the format through-out, to a complete Thunderbirds theme. The annual was also smaller in pagination with only sixty-two pages compered to ninety-four in pervious years. A slight difference also was, the introduction of Lady Penelope, who along with Parker, featured in a novel titled "Ordeal for Parker", and a comic strip titled "Parker".