The Doctor has managed to protect himself and his friends from the signal and - with help from an embittered Vaughn, who is killed during the fighting - the invasion is eventually defeated.
Tobias Vaughn crosses to the wall of his office and activates a switch on a control panel.
To his horror, something inside the cocoon starts to move...
The Doctor and Jamie watch from hiding as technicians attach cables to one of the cocoons and activate the device to which they are connected. well, it's to say the least an unbelievable machine." The Doctor : "Any more unbelievable than the Yetis, hm? I'm not quite so much a sceptic as I was before that little escapade!
John Levene makes his debut appearance as future regular Benton.There is some excellent and highly distinctive incidental music (albeit only about four minutes in total) by jazz musician Don Harper.Stock footage of radar dishes, missiles etc is employed extensively.Suddenly a rogue Cyberman that Vaughn earlier sent mad using the cerebration mentor appears and lurches toward them... The Brigadier's reference to UFO sightings gives an indication of B-movie origins of The Invasion (e.g. Their hand held weapons (seen only in the last episode) produce a flame thrower effect.The Cybermen emerge from the sewers and march through the streets of London as the invasion begins. The headquarters of the United Nations Intelligence Taskforce is a Hercules transport plane (by Spearhead from Space they have become Earthbound). The Brigadier uses a Browning 9mm automatic pistol in this and most subsequent stories.
His initial suspicions about IE's managing director, Tobias Vaughn, are confirmed after he becomes reacquainted with Lethbridge-Stewart, now promoted to Brigadier and in charge of the British branch of the United Nations Intelligence Taskforce (UNIT), and learns that there have been other disappearances at IE premises.