During the outbreak, Greg formed a partnership with Peter Jenkins at Raccoon University with the offer of helping him create a vaccine for the T-Virus. T-Blood, blood from a creature infected with the t-Virus, was offered by Greg to be obtained to create the vaccine. Greg had it in mind to get the blood from Thanatos. However, Peter discovered that Greg was helping him create the vaccine purely due to a personal vendetta, and that Greg actually sought to use the cure as leverage against Umbrella. As such, Peter refused to continue researching with him, and thus T-Blood from Thanatos was rendered useless. Thanatos, however, would not remain dormant.