Anderson's evil plot will not stand!
Background[]
Little is known about Patient 4715 and Dr. Clark is unwilling to release any information on them due to HIPPAA laws. At some point Patient 4715 must have come into contact with Grandma's secret recipe as manufactured by Anderson's Confectionery as well as the Dynalines gas from Dr. Clark's office, which drove Patient 4715 into an aggravated state. His declining mental state led them to become vengeful towards his prior acquaintances, leading to the events of Runaway Train.
It is rumored that Patient 4715 is related to Grandma, possibly directly. This may have provided cause for his descent into madness.
Role[]
It is implied in Factory Reset that 4715 was once an employee of Sciency Things Labs. Though their position is unknown, their ID number (4715) is listed alongside other employees.
Patient 4715 is named as such as he was once a patient in Dr. Clark's psychiatric offices. However, he escapes during the confusion caused immediately prior to the Dynaline Incident. Sometime between Dynaline and Runaway Train, Patient 4715 contacts Ronald Cates and enlists in his help to destroy the gas formula traveling via train to Dr. Clements. Players can locate the luggage he used prior to Runaway Train in the Quandary lobby notoriously referred to as "The Trunk."
It is speculated that Patient 4715 directly contributed to the beginning of the zombie apocalypse. It should be noted that at no point was Patient 4715's goal to stop the doctors from saving humanity, he merely acted out of spite and revenge for becoming the man he is today.