Mariana is one of Stirba's evil werewolf minions, and she was first shown at the funeral proceedings for Karen White. Later in the film, Mariana flirted with a punk gang at a bar, and took them to a deserted warehouse, Once there, Mariana howled loudly and laughed evilly at the group as she taunted them.
The gang searched for Mariana and were looking to have their way with her by any means necessary. Unbeknownst to them, Mariana turned villainous and summoned her werewolf henchmen after the punks, while she snarled and watched as they killed them one by one. During the attacks, the evil Mariana appeared in partial werewolf form, and after the last of the group was killed, the villainess gave a sinister snarl, pleased at her handiwork. Mariana was also later shown in various scenes engaging in a sexual encounter with Stirba and Vlad, also in partial werewolf form. In the film's climax, Mariana was sent by Stirba to fight against protagonist Ben White, only to end up killed by Ben with a silver knife.