The Doctor and Jennifer arrive at a large warehouse near a side street in London twenty minutes from her home. The Doctor, giddy with excitement, reluctantly keeps quiet, for fear of endangering Jennifer from whatever may be inside the building.
"The signal is coming from there." the Doctor says. "Walk slow and be quiet."
The Doctor and Jennifer sneak toward the entrance, darting their eyes back and forth to make sure there are no assailants waiting to surprise them. They slowly open the doors, which make an ear-piercing screech as they unveil the contents of the mysterious warehouse. It is abandoned, evidenced by the cobwebs scattered throughout the room and a layer of dust resting on the floor. There is one lonely white tarp in the center of the room, covering an unidentifiable object.
"Whatever is controlling the Cybermat is under that tarp." The Doctor smirks. "Shall we?"
They both creep up slowly toward the tarp. They each grab one end and yank it off the object like ripping a band-aid off of skin. The object in question is none other than the head of a Cyberman.
"I suspected as much. This, Jennifer, this is the head of a Cyberman. Why just its head though? And how did it get in here?" The Doctor turns on the Cybermat once more using his sonic screwdriver, having brought it to its destination. The Cybermat dashes toward the head, latching on to it and disappearing inside without a trace. The machinery inside the head activates as it starts to glow and come back to life.
"Hold on, Doctor, why'd you turn it on? That thing looks like it could kill us." Jennifer says.
"Oh, it's harmless without its body. Probably no need to worry." the Doctor exclaims uneasily.
"Probably?"
"Hello, I'm the Doctor and this is Jennifer."
"Doctor." the Cyberman replies.
"Remember me? The man who stops the monsters, destroyer of worlds, all that nonsense. What are you doing here?"
"You will not stop us again." the Cyberman replies.
"Tell me then, what are you going to do?" the Doctor questions.
"An invasion is coming, Doctor."
"Well, I've already stopped an invasion of your kind before. Multiple times actually. Wasn't that hard. Was that what the Cybermat was for? Scouting?"
"Its purpose has been fulfilled."
"That's very ominous. No need to work on your threatening attitude there. Bravo." the Doctor exclaims, the confidence inside of him slowly rising in the face of one of his deadliest enemies.
"The Cybermen will rise once again. Humans will fall to the superior race. Prepare for conversion."
The Doctor gasps in pain as the side effects of regeneration submerge. He keels over, breathing heavily.
"Doctor, what's wrong?" asks Jennifer as he kneels down beside him with concern on her face.
"My body hasn't adjusted to the regeneration yet. Usually I need a good rest first. Apparently, before wasn't enough. Do you happen to have any tea on you? It's very good in a pinch—Gah! The Doctor grunts in pain as he begins to lose consciousness.
"Doctor!" Jennifer cries.
"Prepare for conversion. Prepare for conversion. Prepare for…"