Underworld (2003) Underworld: Evolution (2006) Underworld: Rise of the Lycans (2009)
A fourth film is in development, it will be shot in 3-D and sources state that Beckinsale will reprise her role as Selene. There's a possibility of a fifth and sixth movie. Lakeshore's head boss has confirmed the rumors to Collider, saying that the 4th film will be the seterusnya sequel in the group focusing on continuing the story of Beckinsale and Speedman's story.
"It's a theatrical release definitely," Rosenberg tells the site. "I feel great about that. I think it's the strongest story that we've put together of the three. I think it's really terrific. I think it leads to a 4th. When we did the 1st 'Underworld,' we imagined three - the 1st one, a sequel and then a prequel. The 3rd is a prequel, so the 4th would carry on where Kate and Scott Speedman left off after 2, so I think this is going to be terrific really this one." 
The fourth movie is currently aiming for a release tarikh of January 21st, 2011.