Sequels and Prequel
A sequel, titled Underworld: Evolution, in which Markus awakens, was released January 20, 2006. The prequel Underworld: Rise of the Lycans, which gives more detail as to the creation of the lycan species and Lucian's hatred, was released January 23, 2009. A second sequel, titled Underworld: Awakening, was released on January 20, 2012.
Read more about this topic: Underworld (2003 film)