1)Here we have the second appearance of the Ice Warriors as they try to again conquer the Earth. It's an OK story with some major plot holes. The main one is that I find it extremely difficult to believe that the human race would give up all other forms of transport in favor of T-Mat, no matter how efficient it is, nor , having done so, that they would have it controlled through one - apparently undefended - base on the Moon.
2)Of course, the Ice Warriors' plan isn't much better, using a weapon that's vulnerable to water on a planet that's largely covered with the stuff. And they apparently seem to think that knocking out one weather control station in England is all they need to do to prevent humanity from destroying the fungus. Of course, considering that humanity had no back-up for T-Mat, the Martians can't be blamed for supposing the weather control would have no back-up either. Also, they are kind of easily misled by the fake homing signal the Earth people send up - are rockets really that dependent on homing beacons? Additionally, the Ice Warriors are kind of awkward and slow, and seem to have no peripheral vision whatsoever. There's one scene where an Ice Warrior looks right at Jamie and Kelly and somehow contrives not to see them. I did like the little touch of how the Grand Marshal didn't wheze the way the Ice Warriors on the Moon did - since he would of been in a ship with an appropriate Martian atmosphere.
3)The most interesting character in this Fewsham - I'm a sucker for "weak" characters who find their strenght in the end and manage to redeem themselves.
An entertaining enough story so long as you don't examine the plot too closely.
[Part of list of Doctor Who episodes here.]
"How does she know his name? She's never heard it."
This kind of problem crops up in almost every single episode of ROBOTECH. (Re-watching that now, first time in over 20 years. Never mind the BUTCHER-job they did re-writing the plots to badly, horribly, awkwardly try to time 3 completely-unrelated series together, this thing doesn't even work on its own terms.)