The Android Invasion (Fourth Doctor).
The last appearance of Harry Sullivan and Sgt. Benton and unfortunately they had little to nothing to do. The story is good, though when the first alien first appeared I thought it was a Sontaran, but resolves itself too quickly. I think it would have been interesting if the Androids had been able to establish a larger foothold on the Earth before they were defeated. It's also too bad the Brig didn't show up but he probably wouldn't have had much of a role.
The Robots of Death (Fourth Doctor).
Robots gone amuck! A fun story though once again resolved a little too easily.The captain of the mine is a fun character to hate. The idea of Poul and D84 being agents for the mining corporation was interesting but it wasn't developed enough and D84 came across as unintelligent in some scenes despite being programmed for investigation.