Sleepwalker, an alien from another dimension has entered Rick Sheridan's mind. When Rick sleeps, Sleepwalker can exit Rick's mind and roam the Earth.

The Sleepwalkers were dream police. They apprehended any beings attempting to invade the sleeping minds of humans. Somehow Sleepwalker has become trapped in the mind of a Brooklyn college student named Rick Sheridan. With a Brooklyn neighborhood's safety in the balance, Sleepwalker must continue his path of justice here in our dimension which means going up against the technological brilliance of disgruntled ARCH Labs employee, Jeff Hagees, AKA 8-Ball.