Favourite UNIT Story

I re-watched The Daemons again last night and I am certain in my choice. Such a wonderful story where everyone gets a chance to shine. UNIT was certainly limiting from a writers perspective (essentially you only have 3 stories to play with: Alien Invasion, Mad Scientist or Plague) but I loved pretty much all of the stories on that list. I struggle to find one I don't like! Even though it was on after the original list, Power of Three was enhanced by UNIT