The Ambassadors of Death - Episode 4

Lots of loyalties broken and true loyalties revealed in this episode. Not too much in the way of "big action", but it doesn't feel slow at all. Liz escapes, only to be caught again right away, so that was a bit of padding, but never mind. The bad guys gain the ability to control the radioactive spacemen. Which leads us into a great cliffhanger. The Doctor enters Sir James' office, finding him dead. He leans over the corpse, listening for a heartbeat, as the spaceman (who we have just seen kill people, including Sir James, with just a touch) creeps up behind the Doctor, reaching out a hand towards our hero...