Flash Gordon Conquers the Universe (1940)

This was by far the weakest of the three Flash Gordon serials. It's too long and the action slows down considerably. With that said, there are many good moments throughout. This time, we get a brunette Dale and some nice scenes in Frigia, the snow kingdom.

Each episode features a title crawl, recapping events from the previous episode. The idea was so good it was "borrowed" for a later sci-fi series by some guy named Lucas.

The whole Purple Death thing is pretty hokey and the villains don't quite rise to the occasion, but Queen Fria is a nice addition.

Personally, I would look for the feature version of this one and skip the serial. Otherwise, get your fast-forward button ready for the slow parts.