This one was commissioned to celebrate ten years of our celebrated Time Lord, and it pitches the "Doctor" (Jon Pertwee) against his most deadly foe yet! Indeed such is the peril faced by the entire galaxy, the folks on "Gallifrey" have broken just about every rule of time there is to provide him with the support of his earlier iterations - Patrick Troughton and William Hartnell. What's the problem? Well it seems that anti-matter is gradually taking over the universe and the process looks like it will quite literally lead to the big bang. With "Jo" (Katy Manning) and the redoubtable "Brigadier" ...