There is nothing wrong with your Television set. Do not attempt to adjust the picture. We are controlling transmission. For the next hour we will control all that you see and hear. You are about to experience the awe and mystery which reaches from the inner mind to The Outer Limits.

A man experiments with consciousness expanding drugs and accidentally lets loose the monster inside himself.

As far back as men have recorded their history, veils have been lowered to disclose a vast new reality –rents in the fabric of Man's awareness. And somewhere, in the endless search of the curious mind, lies the next vision, the next key to his infinite capacity...

Professor Peter Wayne is disturbed to hear that his university colleague, Dr. Roy Clinton, is pursuing forbidden drug experiments with a group of graduate students. When one of the students turns up dead, Professor Wayne investigates Clinton's activities. He discovers that consciousness-expansion can have powerful and dangerous consequences.

Some success, some failure, but either way the gnawing hunger to know is never sated, and the road to the unknown continues to be dark and strange.

(Homeier, Doohan, Andes, Wingreen and Duryea all appeared in Star Trek: The Original Series)

• "Expanding Human" at IMDb