3/4 good episode!
Loved seeing UNIT and the Brig's daughter. They need to bring her back! Loved all the character comedy. And it was interesting to see a "boring" alien invasion that didn't do anything, lol. It set up a very intriguing mystery that kept you glued to the story even though nothing was really happening.
This is season is much better than the last two so far. I've been into every episode, versus last year where the non-story arc episodes left me feeling bored.
Asylum Daleks 3.5/4
Dinosaurs on a Spaceship 3/4
Town Called Mercy 2.5/4