Mark Kenniston
Dr. Mark Kenniston was a junior pathologist employed at Chicago's City Hospital. He was disillusioned with his work and unsure if he could complete his remaining years of internship to become a full-time pathology. He didn't have much of a person life, although he was romantically involved with nurse Edie Hempstead.
One day on his way to work he stopped by his favorite diner for breakfast, where he discovered chaos. Some kind of amorphous creature had emerged from the sink and had begun absorbing the kitchen staff. Escaping with the diner's dishwasher Harry Schwartz, Kenniston attempted to warn the police, but Sergeant Dwyer brushed them off, as the department was already swamped with an influx of missing persons reports.
Kenniston returned to the hospital with Harry accompanying him. There, the "clone" attacked the hospital's cafeteria, absorbing several people. Harry used a meat cleaver he'd appropriated from the diner, and cut off a piece of the clone which Mark captured in a sugar jar. He, Harry and Edie took the clone sample to the pathology lab where they ran tests, observing the clone tissue's consumption of numerous mice. Assisted by his supervisor Dr. Agnew (who had his own close call with the clone) Mark discovered that iodine could kill the clone tissue.
An intern assisting them got careless and got the clone on his hand and Mark tried to kill it by pouring iodine on it; however this only killed the surface. The clone went inside the intern's arm and absorbed him from the inside-out. Not long after this, Health Commissioner Sorensen arrived and spoke with Mark about the crisis. Mark was aghast to learn that Mayor Slattery was blaming the situation on "sewer snakes" and planned to flush the sewers to get rid of the clone.
Angered, Mark, accompanied by Sorensen, went to see the Mayor personally at the TV station, where Slattery was forced at gunpoint to let Sorensen take over to tell the public the truth. With that taken care of, Mark coordinated with the Mayor and other city officials to properly deal with the ravenous lake of slime living beneath Chicago's streets.
