Neptune

Neptune, named after the Roman god of the sea, is a B.O.W. that was created by implanting the T-Virus into a great white shark. It was given the development code of Fi-3 and was created specifically to test the effects of the virus on a sea creature. The creature was accompanied by two smaller offspring underneath the Umbrella Residence. During the viral outbreak in the facility, Neptune and its spawn were released from their water tanks by a scientist, who had gone mad, flooding the entire Aqua Ring. Two Neptunes swam in the river bordering the Raccoon University; precisely where they came from is unknown. Although these two were almost certainly killed when Raccoon City was destroyed it is unknown if any more were in the river that managed to get outside the quarantine zone. The fact that the sharks were swimming in freshwater is apparently a product of their T-Viral infection.

According to various research notes found in Resident Evil: The Umbrella Chronicles, the umbrella researchers were disappointed with the creation of Neptune. The T-Virus did not significantly improve the already impressive strength of Great White Sharks, and it was still helpless out of water. However, Umbrella apparently continued further research on the animals as 3 enourmus Neptunes appear in Umbrella's Russian base of operations, where Chris Redfield and Jill Valentine must cross a small tunnel flooded with water where 3 60 foot long (Presumably) sharks vaguley resembling Neptune lurk. After crossing one of two bridges in the strong water they left the sharks and headed to the area where they destroy failed B.O.W.s.

Appears in: Resident Evil (Original PSX and Sega Saturn versions, Deadly Silence and GameCube remake), Resident Evil Outbreak, Resident Evil: The Umbrella Chronicles.