This story is centered around the Doctor's response to trolley problems, which makes for a very compelling story, though I'm not sure if I agree with this interpretation.

Deimos: C. The Resurrection of Mars: A.

This was my favorite Ice Warrior story so far! Better than the two NuWho stories IMHO. Some great music and tense moments as well. Was very surprised about the cliffhanger too, did not expect that!

Gonna be honest, this was a very forgettable story. Tamsin wasn't likable, the Ice Warriors were bland, and there sidecast had few standouts other than David Warner (yippie!) and Tracy Ann Oberman (boo!). This exists solely to build up to the next part and that's fine. 4/10.