Steed swings into action when the janitor (Geroge Pravda) at a medical research lab steals a vial of radiactive material. The search becomes even more intense when Keel discovers that the stolen vial will soon kill the janitor and everyone else with whom he comes in contact. Meanwhile, the thief and his girlfriend arrange to leave for Europe, but the contact man making the arrangements has murder on his mind. Originally telecast live on February 25, 1961, "The Radioactive Man" was written by Fred Edge. ~ Hal Erickson, Rovi