The Proselyte is the player character in the Epsilon single player campaign.
Lorewise, this man was alleged to be Yuri's second-in-command as well as the PsiCorps', and later, the Epsilon Army's, most skilled field commander, who led the PsiCorps and the Epsilon Army in their insidious operations throughout the Third World War and the subsequent Mental Omega War.
Most of the details about the Proselyte have been shrouded in secrecy, and his name, background, and origins remain unknown.
- Proselyte is a Biblical term for "stranger", or a "newcomer to Israel", a "sojourner in the land", and in the Greek New Testament, for an early convert to Judaism. In English, the word has a general meaning of "a new convert to any particular religion or doctrine".