Before watching the movie:
Action. Comedy. Probably little to do with the TV series, but attached to one anyway. Angels.
Apparently the martial arts angle is an addition to the TV series. Having only been exposed to promos for the movies and that famous bathing suit photo of Farrah Fawcett, fighting is an integral part of my understanding of the show. Not that watching the movie is going to help me understand what else there was (probably espionage infiltrations).