James Ellwood: master programmer. In charge of Mark 502-741, commonly known as Agnes, the world's most advanced electronic computer. Machines are made by men for man's benefit and progress, but when man ceases to control the products of his ingenuity and imagination he not only risks losing the benefit, but he takes a long and unpredictable step into... the Twilight Zone.
James Elwood, a computer programmer, replaces a computer programmer named Fred who cannot resolve a functional error in the office computer. Elwood fixes the problem, and later develops a romantic interest with a co-worker, Millie. After he proves to be romantically inept with a live female, he resorts to his computer (named "Agnes") for advice. However, the computer ends up giving Elwood bad advice which leads to Millie meeting and spending the evening with Elwood's romantic rival, another programmer. The next day, Elwood gradually realizes that "Agnes", the supercomputer he works on, has fallen in love with him and is losing logical control over its own functions. Elwood cannot resolve Agnes' dysfunction and his boss suggests that Elwood take a vacation. His replacement? His romantic rival, the computer programmer who was formerly Elwood's subordinate and will now be spending time with Agnes himself.
Advice to all future male scientists: be sure you understand the opposite sex, especially if you intend being a computer expert. Otherwise, you may find yourself like poor Ellwood, defeated by a jealous machine, a most dangerous sort of female, whose victims are forever banished... to the Twilight Zone.