The Green Death - Episode 4

At last, the Brigadier gets some reinforcements. Sergeant Benton is back. As is Captain Yates, though Mike is actually working undercover to infiltrate Global Chemicals. I like that aspect of the script, I don't think we've seen much UNIT undercover work, so it's a nice change of pace. The Doctor dressing up as the milkman and the cleaning lady is a bit weird, but it works to get him inside Global Chemicals, I guess. The revelation that the mysterious "BOSS" is actually a computer isn't enough of a shock to be the cliffhanger, now, is it? Maybe back then, but now it's not as shocking.