Can anyone remember a storyline (Peter Davidson I think), where the episode cliffhanger was as thus: Old white-haired dude: "This isn't me..."(procedes to lift off his face or raise it up, revealing a creepy robot face) "This is me!" I think he was benign though, not a baddy.
Thanks for answering.
I wasn't sure so I had a look on that Dr who Site.
Turns out it's "Four To Doomsday".
The cliffhanger of episode 2 as thus:
Bigon demonstrates to an astonished Doctor that within his chest and beneath his face there is just a mass of electronics. Holding up a printed circuit connected to his chest, he states: 'This is me.'