This was a very nice way to begin the second season, despite breaking the streak (for me) of 5-star opening episodes. While I do think the first episode was quite good, it just doesn't reach the level of Season One's outstanding openers. I really like the environmental and 'ruthless businessperson' commentary, however, and the set design was rather creative considering the ever-present budget constraints. Overall, this story is a lot of fun. There are a few scene-breaks that are slightly jarring, likely a result of reducing the episode count from four to three, but I do love seeing our heroes muck about in a giant laboratory. Oh, before I end this, I have a message for one of our intrepid TARDIS Team. Dear Barbara: There is a fine line between stoicism and obstinacy; and you've been living on the wrong side of it this entire story. Seriously, this may be the one story in her entire run where Barbara isn't my favourite character. This one still rates a solid 8.25/10 from me. Next up: that one. You know the one.