I don't know why, but I really like programs where a scientist tries to discover something and ends up battling unintended consequences of his/her research. (I'm not a big "X-files" fan, but I've always wanted to see the episode "Soft Light" where a former research scientist has a shadow that, if it touches someone, disintegrates them.)

In this one, two scientists doing research for the U.S. Department of Defense are on the verge, they think, of a formula which has the ability to make people who drink it invisible. It's worked on laboratory animals...now it's time to test it on a human subject. A subplot involves the lead researcher, who has gotten too involved with his work at the sake of his marriage. At the same time his wife breaks news to him that she wants to divorce him for another man, he tells her that she may never see him again, and explains that he intends to be the first human subject on which this formula is tested and that there's the possibility for error. (It's clear that he doesn't truly want to see the marriage dissolve, but that he loves his wife and wants only the best for her.)

The two researchers sit down in a laboratory. The assistant, obviously uneasy, asks whether the lead scientist truly wants to go through with the experiment...he does, and the experiment goes ahead. They wait for several minutes past the time when their calculations say the scientist should have grown invisible. Nothing happens. Frustrated, they know they'll have to go (as the "Green Goblin" said in last year's "Spiderman" movie) "back to formula". They decide to go out for a meal that afternoon.

Walking along the sidewalk as the evening sun sets, suddenly the assistant researcher freezes and says "Look at the sidewalk". He has a shadow, but the lead researcher who drank the formula does not. They run back to the laboratory to try to understand what happened.

That evening, a cranky researcher feels something has entered her office. She can't see or hear it, but sees a black shadowy figure moving along the wall, moving toward her... 