Re-Agent

Re-Agent is a fictional chemical featured in the Re-Animator multimedia franchise. It is most widely recognized for its usage in the 1985 film adaptation of Re-Animator, but has also appeared in the movie's sequel projects, Bride of Re-Animator and Beyond Re-Animator.

Description
Re-Agent is a chemical formula developed by a brilliant medical student named Herbert West. Distilled into a glowing green liquid, Re-Agent had the ability to reanimate dead skin tissue.

Herbert West first developed Re-Agent while taking classes at the University of Zurich. He experimented on one of the staff members named Doctor Gruber. How West chose to select Gruber as his test subject is unclear, but after giving him an injection of Re-Agent, the man suffered adverse physical trauma. His face became ashen and sunken in and he began screaming in agony.

Doctor Gruber's howls of pain alerted some of the nursing staff as well as two university policemen. They barged into Gruber's office where they found West hovering above the man who was still in the throes of massive pain. Gruber suffered a hemorrhage of some kind that caused his eyes to explode, and he fell down dead. The nurse accused West of killing him, but Herbert denied this, citing, "No I did not! I gave him life".

West then relocated to Miskatonic University in the United States where he continued to work on his experiments with Re-Agent. He brought on fellow assistant Dan Cain and used Re-Agent to reanimate Cain's dead cat.

West later used Re-Agent on the school's dean, Alan Halsey as well as instructor that he despised, Doctor Carl Hill.