In 2002, Jack Krauser joined Wesker's organization and became his most loyal follower, wholly believing in his ideals. In 2004, Wesker sent an invitation to a spy he had previously worked with in Umbrella's rival company, Ada Wong, to join his organization. Both Krauser and Ada were sent to retrieve a dominant species sample of the Plaga in Spain, and although the mission was a success, Wesker was betrayed by Ada, who only sent him a mere subordinate species Plaga. Although his plans were temporarily stalled by this betrayal, he successfully recovered the dead dominant species Plaga from Krauser's corpse.