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.

Now THIS was what I call a fun story. The Ice Warriors, who are continuously proving to be very boring as enemies, are still forgettable, but that's fine because we get not just the Abbot Thelonious Monk back, who is an absolute joy, but Lucie herself!!!! Yeah girl, get that fraud outta here! 7/10.