Albert Wesker, a key antagonist in the Resident Evil series, was once a high-ranking Umbrella Corporation scientist and S.T.A.R.S.
Team leader.
After betraying his team during the Raccoon City incident, he faked his death and became a powerful bio-weapon-enhanced villain working with various organizations, including the mysterious "Organization." His story involves manipulation, betrayal, and a quest for global domination through viral outbreaks.
Wesker ultimately meets his demise in Resident Evil 5 after a final confrontation with Chris Redfield and Sheva Alomar.