For maximal enjoyment of the Underworld series, watch in the following order:
1.Underworld (2003): This is the starting point for getting a perspective on the origin of the vampire-Lycan conflict.
2.Underworld: Evolution (2006): This movie picks up where the original left off, only plumbing deeper into the mythology.
3.Underworld: Rise of the Lycans (2009): A prequel explaining the history behind Lycans and their war with the vampires.
4.Underworld: Awakening (2012): After years of sleeping, Selene wakes and will do anything to locate her daughter.
5.Underworld Blood Wars (2016): This is the latest movie of the saga, where several plot threads are going to be adequately fixed.