Geronimo1967
"Sir Reginald Styles" is about to convene a conference that could finally deliver world peace when he is the victim of an assassination attempt. This attracts the attention of UNIT and so the "Brigadier" (Nicholas Courtney) drafts in the help of the "Doctor" (Jon Pertwee) and "Jo" (Katy Manning) to investigate a strange glowing device. It turns out that this is some sort of a portal to the future from which someone is sending heavily armed guerrillas. Why, though? Well pretty quickly we discover that it's the eponymous antagonist of the "Doctor" who are determined that their empire shall not be compromised by the meddling of their pesky foe. As the cat and mouse game ebbs and flows, the "Doctor" has to deal with not just his old enemy, but ...