The Mindscape is a dimension that borders on the minds of all intelligent beings and living things, inhabited by many strange creatures. Some of them are very dangerous, seeking to invade the sleeping minds of humans. The Sleepwalkers act as guardians to defend these minds and the Mindscape, almost as a sort of "dream police", apprehending such evil creatures. One such Sleepwalker was tricked by his archenemy Cobweb (who like Sleepwalker had a real name that is unpronounceable by humans) into entering the mind of a New York college student named Rick Sheridan and became trapped.
Rick himself is an ordinary human being, majoring in Film Studies as a college student. He lived in a Brooklyn apartment with his dog Rambo, where he worked as a building superintendent, doing maintenance work in exchange for living rent-free. He also earns a living as a part-time job teaching English to immigrants. Rick had an on-again off-again romance with a girl named Alyssa Conover.
