Dr. Michaels

"I've been studying one of the specimens we brought back to see if there's something physiological that would be a weakness - a way to stop them. I've found nothing so far."

- Dr. Michaels to the Marine

Dr. Michaels was a scientist who worked in the Delta Labs on Mars. He was one of the few people who survived the first wave of the demon invasion. During the invasion, Dr. Michaels poorly barricaded himself in his research lab and began studying the corpse of an Imp brought back from one of the Portal expeditions, hoping to find a weakness and possibly keep his sanity at bay.

The player encounters Dr. Michaels in his lab wearing a HAZMAT suit, due to him working with biological specimens. He is frightened at first but is relieved that the player is not a demon. Michaels gives the player the code 624 for a pair of storage cabinets in the adjacent room, then asks him to go get help and states he does not want to leave his lab. What happens to Michaels is unknown but there's a good chance he was killed off-screen, since Dr. Michaels' lab was poorly barricaded and the Resurrection of Evil intro states that the Marine was the only survivor.