I also didn't know about TV series of the 'Mist', but I saw a movie and liked it very much!
But speaking about Steven King's 'movies' (I mean, films which are based on his books) my absolute favourite is 'The Shawshank Redemption'.
I write as a freelance writer (you can learn more here) on different topics, and I wrote about adaptations of works by Stephen King once, and about the top modern writers... He is a great personality!