THE YEAR IS 2540. TENSIONS ARE ONCE AGAIN rising between the two great spacefaring empires of Earth and Draconia. Each accuses the other of having attacked their cargo vessels, violating boundaries established after their last confrontation 20 years before. When the TARDIS lands the Doctor and Jo Grant inside the hold of Earth cargo ship C-982, an ultra-high-pitched sound causes its crew to see the pair as ‘Dragon’ raiders. In reality, the ship is under attack by brutish Ogrons – but only the Doctor can see the alien assailants as they really are.