Jack Krauser was an ex-US Army veteran with many tours under his belt - and he often participated in mercenary work on the side. His military career was cut short when he participated in an infiltration mission named Operation Javier for US-SOCOM with
Leon S. Kennedy where they encountered
t-Virus Bio-Organic Weapons (B.O.W.s) and was critically injured when one of them impaled him through the arm. He also became rather jealous of
Leon's glowing reputation, and later began to see the benefits of
t-Virus mutations and soon sought out
Albert Wesker, one of the few people that understood the true benefits of the infections.
The attack forced him into an early retirement, and as he was a military man through and through - civilian life would not be possible. Jack needed power, he needed to recover quickly. He worked closely with Wesker to infiltrate the
Los Illuminados, a religious cult which worshipped the
Plaga, a unique parasite which could increase strength and cause many beneficial mutations. His mission was to steal a Dominant Species
Plaga egg - this was an enhanced specimen which could inhibit control over the regular or Recessive Species varieties.
Los Illuminados leader
Osmund Saddler did not accept Krauser instantly - he was tasked with kidnapping the US Presidents daughter
Ashley Graham and bringing her to them in order for them to then infect her with a
Plaga and return her to US soil which would then begin to spread the
Plaga there and eventually everywhere else.
However, Krauser became so lustful for power and he could see first-hand the possibilities with the Dominant Species
Plaga egg, as soon as he obtained the sample from Saddler for completing his task for them he implanted it in himself - betraying his initial mission. The
Plaga gifted Krauser with enhanced speed and strength, as well as the ability to mutate his damaged arm into an arm-blade which became almost indestructible. However, Saddler still did not trust him and soon
Ada Wong was brought into the fray - and then Wesker changed his mission parameters to eliminate
Leon S. Kennedy, who was on a US-STRATCOM mission to rescue
Ashley Graham from the
Los Illuminados.
Soon,
Leon and Krauser confronted one another and they entered combat - Krauser had the upper hand as he had multiple
Seeker drones, a sub-machine gun, flash grenades and his aforementioned
Plaga enhancements.
Leon managed to defeat Krauser by attacking his legs - which resulted in his chest exploding in a shower of blood. However, his
Plaga managed to piece enough of him together to bring him to his feet one last time.
Severely weakened, he divulged information about
Ashley Graham's whereabouts, he also briefly discussed his links to Umbrella who at that point were assumed to be defunct to
Leon's surprise. He was soon finally defeated by
Ada Wong who put him down for good.
His initial mission was not a failure however, as
Albert Wesker managed to obtain a Dominant Species
Plaga sample from his dead body and use that as a basis to develop more. Although Jack Krauser was now dead, being killed in combat is the greatest wish for some hardened soldiers so it's likely that he accepted his fate.
