A private detective agency, "World Securities Corporation," has elite field agents, "Probes," outfitted with implants (an "earjack," which allows worldwide voice communication from a centralized control room, and a "dental contact" that allows discreet yes/no replies and Morse code), as well as a "scanner," a combination television camera, microphone, and transceiver approximately the size of a large button. Hugh O'Brian, Tony Franciosa, and Doug McClure as the field agents, with Burgess Meredith as Director, assisted by various specialists ranging from a hacker to a linguist to a medical doctor, in a room resembling a NASA MOCR.