ELM

A college professor seeking to study the phenomena of dream walking, the ability to enter another's dreams, is given the authority by his superiors to study these phenomena if he can find volunteers. Unbeknownst to the good doctor and his volunteers, there is something dark waiting for them to open the door into their domain of dreams.

Note: this story is only a rough outline of an idea I had to make a crossover for: A NIGHTMARE ON ELM STREET, FRIDAY THE 13th, HALLOWEEN, and HELLRAISER. Honestly, expect it to be of subpar quality.