The story is quite simple. A common thug chances on a metal that when struck, literally absorbs the missile. For instance, a bullet is pretty much absorbed. The finder is an escaped convict who tries to turn his find into cash. He goes to a professor's lab and threatens him with a gun. They make a deal, but the professor uses it as a diversion. Unfortunately for him, he fires at the man, hitting the metal and having it ricochet back, killing him. The rest of the episode is about the pickup of the cash as the bad guy explains how he came upon the metal. Apparently it was an alien craft. While the metal is interesting, there is nothing very intriguing about it.