The zombie is the most common enemy in the game, the poor passengers of the train and the Umbrella staff of the Training Facility, who became infected with the T-Virus.
There are many different types of zombie in the game, normal passengers on the train, Umbrella special forces, and many others.
The zombie is an easy enemy, as long as they're in small numbers. The Handgun is enough to keep them at bay. It's possible to decapitate one or many zombies with a single shotgun blast, simply aim up when they come into grabbing range, and fire.
The Centurion is the large centipede creature discovered in Umbrella's Management Training Facility. This is not a B.O.W. born from the T-Virus experiments, but rather was mutated through accidental exposure to the virus. This multilegged, carnivorous creature survives by preying on humans. As you may expect, the Centurion is far larger than the tropical centipede, and its behaviour is far more aggressive.
Insect-based B.O.W.'s that were created by injecting various types of insects with the T-Virus and then manipulating their genes. Because they were developed relatively early in the program, they've had a lot of time to grow.Some are almost two metres long and have suitably long death-dealing pincers.
A B.O.W. born from early experiments with the T-Virus. Almost immediately upon beginning the virus research, a huge number of failed experiments were produced. The Lurker is one of those failed experiments, and it is made from an amphibian frog base.
Their eyes and ears have devolved greatly in this form, but their ability to sense prey has been evolved to an almost supernatural level. Their tongues in this form have become strong enough to actually impale a human target with little effort. Their digestive systems have also developed to the point where they can swallow a human whole, as those systems are now strong enough to kill whatever prey they swallow almost immediately.
The Queen Leech in all its hideous glory. Up until now it has appeared under the guise of a young James Marcus, however when you come to do battle against it it bares very little resemblance to its original creator.
Queen Leech (Second Form)
After defeating the Queen Leech, it undergoes a rapid mutation which increases its size and also its resistance to conventional firearms, making it practically invulnerable to anything you have at your disposal. However it does have a very strong weakness to sunlight...