A strong start, with great atmosphere, but then.... all downhill and fast. Nyssa and the Doctor are written wonderfully here, and performed well, but the guest cast aren't as nearly as interesting, and poorly written in its display of Alaskan native Americans.

Story wise, its ok. Animated-dinosaur-skeleton-like creatures is a good idea, and Big Finish carry on trying stories that work for its medium, and wouldn't cross the barrier well into TV, but, from the interesting set up, they felt out of place, and didn't carry well for me throughout.