of different characters following the events of the game. The Mercenaries mode and alternate costumes for Jill do not need to be unlocked in the Windows and Dreamcast versions of the game. Plot On September 28, 1998, 24 hours prior to the events of Resident Evil 2, former Special Tactics And Rescue Service (S.T.A.R.S.) member Jill Valentine attempts to escape from Raccoon City. Most of the population has 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, who is killed by a new enemy. This creature, Nemesis-T Type, is a bio-organic weapon programmed to target surviving S.T.A.R.S. members, witnesses of Umbrella's experiments. As she evades Nemesis, Jill encounters three surviving members of the Umbrella Biohazard Countermeasure Service (U.B.C.S.): 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 the city's Clock Tower and ring the bell. As they make their way to the tower, Nikolai is presumed dead, while Nemesis corners the remaining members of the group on the cable car headed to the tower. Mikhail sacrifices himself with a grenade, causing the car to crash into the tower's main courtyard and separating Jill and Carlos briefly. At the Clock Tower, Jill summons the helicopter by ringing the Clock Tower's bell before being confronted by Nemesis, which destroys the helicopter and infects Jill with the T-virus. Jill manages to temporarily defeat Nemesis but falls unconscious due to the T-virus. Carlos finds Jill and takes her to safety within the Clock Tower. Three days later, he finds a vaccine for Jill's T-virus infection in a nearby hospital. He then returns and administers it to Jill, saving her. After she regains consciousness, Jill proceeds towards the Raccoon Park and enters the park caretaker's cabin. There, she runs into Nikolai, who reveals that he is a "supervisor" sent into Raccoon City to gather combat data of Umbrella's bioweapons. Nikolai retreats, and Jill is confronted by a massive worm-like creature. Jill defeats the creature and escapes to an abandoned factory at the rear of the park. Inside the factory, Jill meets up with Carlos, who tells her that the U.S. government is planning to launch a nuclear missile