The Brain Sucker is the result of an arthropod suffering a secondary-infection from the t-Virus. It is a close relative of the Drain Deimos.
These creatures were birthed from arthropods that had been infected some time during the Raccoon City Destruction Incident. They were seen inhabiting the Incineration Disposal Plant P-12A, which had been infested by the t-Virus even before the G-Virus capture mission which led to a widespread infestation of the city.
- ↑ Resident Evil Archives. BradyGames. p. 171.