You unlock

this door with the key of imagination.  

Beyond it is another dimension -- a dimension not only

of sight and sound, but of mind.  There is a fifth dimension beyond that

which is known to man.  It is a dimension as vast as space and timeless

as infinity.  It is the middle ground between light and shadow, between

 science and superstition, and it lies between the pit of man's fears and the

 summit of his knowledge.  You're about to enter into a land of both

 shadow and substance, of things and ideas....a journey into a

wondrous land whose boundaries are that of imagination.  

It is an area which we call the....

Twilight Zone !!