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Hazmat (Keith Kilham) is a fictional character created by Electronic Arts, in conjunction with Marvel Comics, in their first attempt to bring Marvel heroes to a video game platform, Marvel Nemesis: Rise of the Imperfects. Hazmat, along with a line of EA created villains known as the "Imperfects", can be fought against, and is also an unlockable character.

Doctor Keith Kilham was a quiet unassuming scientific nerd who worked for the US Defense Science Board. He reported directly to the Pentagon and dealt with mankind's most lethal substances: the Ebola virus, anthrax, ricin, cyanide, Mustard gas, Sarin gas, & VX gases. It was Dr. Kilham's job to find immunization vaccines for the world's deadliest substances. Ironically, Kilham's own resistances were remarkably weak -- he would catch every cold and flu around him and was endlessly popping meds so that he could continue working.

Kilham's lab was compromised by terrorists during a tricky biological test. Safety containment procedures were rendered useless. Kilham had to react quickly — several agents were on the verge of contaminating the main research facility — the staff and the entire community were at risk. Despite the fact that his vaccines had yet to be tested on human subjects, Kilham injected himself with five highly unstable test immunity agents. He then rushed to the lab to secure the unleashed substances, hoping his vaccines would protect him.

The lab staff was quarantined for a month. Kilham told no one about the injections and was the only person to experience side effects from that fateful day. His body slowly started to dissolve as his molecular make-up shifted. He was becoming living mutation. With help from his spies in the Pentagon, Roekel had Kilham kidnapped and brought to his secret research center. Roekel was fascinated by his unstable DNA.

Roekel devised a way to control Kilham's degenerative process and harness the power of his new found molecular make-up. With a tech upgrade, the disfigured and severely mutated scientist was reborn as the terrifying Hazmat. Driven by a desire to cure his state -- and find cures for all the chemical weapons which afflict human kind, Kilham retains his mildmannered nature and can be relied upon to deliver the most measured response to any crisis the Imperfects face. He still pops pills to fight off colds.

During the Imperfect invasion, Hazmat defeated Venom and would go on to attempt and take back Paragon to Niles Van Roekel. However, he failed at this after being defeated by Magneto. During the course of the game, Spider-Man defeats him as well.

Marvel hasn't used any of the Imperfects in any other story for years now, it seems very doubtfull they ever will.

• Official Marvel Nemesis: Rise of the Imperfects Website - Official Marvel Nemesis: Rise of the Imperfects Homepage
• IGN Marvel Nemesis: Rise of the Imperfects Website - IGN's Marvel Nemesis: Rise of the Imperfects Website