WRITER:     George Clayton Johnson

DIRECTOR:   Marc Daniels

PRINCIPAL:  Kirk         M113 Monster

            Spock        Yeoman Janice Rand
 
            McCoy        Professor Robert Crater

            Sulu         Darnell

            Uhura        Green

            Nancy Crater

When the Enterprise's landing party arrives on planet M113 to give a routine medical examination to Robert and Nancy Crater, a nightmare unfolds when several members die, every trace of salt mysteriously removed from their bodies.  Since McCoy was once deeply in love with Nancy, He's especially concerned for her safety.  However, the real Nancy Creater is already dead; a being has taken her form and needs salt to survive. Because Crater's supply is gone it has only one source-the crew of the Enterprise.


Airdate:  September 8, 1966