Resident Evil 3: Nemesis begins 24 hours prior to the events of Resident Evil 2 and follows Special Tactics And Rescue Squad (STARS) member Jill Valentine as she attempts to escape from Raccoon City. Nearly all of Raccoon City's citizens have been transformed into zombies by an outbreak of the T-virus, a new type of biological weapon secretly developed by the pharmaceutical company Umbrella. On her way to the Raccoon City Police Department, Jill runs into fellow team member Brad Vickers, but he is subsequently killed by Nemesis, a bio-organic weapon created by Umbrella for the sole purpose of eliminating surviving STARS members, who are first-hand witnesses of Umbrella's unethical experiments. After evading Nemesis, Jill encounters three surviving members of the Umbrella Biohazard Countermeasure Service (UBCS): Carlos Oliveira, Mikhail Victor and Nikolai Zinoviev. Nikolai explains to Jill and Carlos that a rescue helicopter can be contacted if they manage to reach Raccoon City's Clock Tower and ring the tower's bell.