I must say I am not particularly familiar with the live action Underworld movies. I may have seen the first quite a while ago, but that's it and I don't remember really a lot anymore. "Underworld: Endless War" is an animated 17-minute short film from 4 years ago directed by Juno John Lee. Basically, it is actually a collection of three 5-minute short films that play during very different times, even centuries. It's the old story of vampires vs. werewolves again, or I should probably say Vampires vs. Lycans. A young woman goes against a trio of dangerous Lycan terrorists, one per segment. The makers here were not scared of depicting sexuality and violence in a pretty graphic fashion, which certainly helped the movie. No taboos here. A good watch and I recommend, not only to those who loved the movies. Thumbs up.