The plan was undone by some logistical challenges. Both branches of Umbrella were initially unable to create B.O.Ws with sufficient intelligence. In the eyes of the military, this made them a liability on the battlefield.
Fortunately (for Umbrella), a breakthrough was made when Umbrella USA was able to manufacture a B.O.W under the Tyrant Project that sported more human-like intelligence. Known as the T-002, this revolutionary creation was cloned in order to create more advanced models known as T-103s. Unfortunately (again, for Umbrella), the T-002 was destroyed by S.T.A.R.S. during the events of the first Resident Evil game.
Interestingly, Umbrella Europe had begun work on a parasite years ago that they hoped would be able to infect a host and create the ideal B.O.W. While they were not able to find a suitable human host, the T-103 clones proved to be strong enough to survive the infection. Some of the creations proved to be somewhat too independent and ego-driven, but Umbrella Europe still felt confident enough to send their creations to Racoon City for field testing.
One of those B.O.Ws that Umbrella sent was instructed to hunt and kill all surviving S.T.A.R.S. members in order to see how it fared against the team that bested its predecessors. That B.O.W. was internally referred to as the Pursuer, but you probably know him better as the Nemesis.
What Separates the Nemesis From Mr. X?
Those of you who played 2019’s Resident Evil 2 remake (or, for that matter, any version of the first two Resident Evil games), might think that the idea of a lumbering mutant who chases the player sounds pretty familiar. However, there are a few key things that separate the Nemesis from Mr. X and the earlier Tyrants in the series.