The T-Virus is the basis for Resident Evil: Dead Aim 's T/G Virus (also known as Reagent 92). It is, as its name suggests, a fusion of the Tyrant and Gene Viruses. It imbues its carriers with qualities of both its parents strains, as well as odd electrical properties. As demonstrated by Morpheus Duvall, it causes instant mutations when injected into a human host. In Morpheus' case, it went so far as to change his gender, but as he is the only known host in the series, it is unknown if this is a common or random effect.