Should have been three episodes. That last episode in particular has too much tedious running around. It doesn't help that the villain is less interesting here then during their previous appearance.

Part of Doctor Who's charm is the dissonance of world ending events happening in the most banal of places. However, Amsterdam as a location just feels pointless in this episode, and I can't help wishing that the whole thing was set on Gallifrey.

On the upside, Colin Baker is great  as a Time Lord heavy.