Margie del Monsalvat

, née Margery Stokes, was a showgirl in Chicago in the 1930s.

When the Master met her, she hadn't been fazed by his use of the Tissue Compression Eliminator. She liked his cold eyes. She became his secretary and he promised her a house in Hollywood.

Margie accompanied the Master to the Wainwright Museum, where the Flagstaff tektite was located. There the Master learned that Margie had already been attempting to take the tektite, long before she met him. She was in league with the Master's rival, Joe Clementi, and tried to control the Godhead. (PROSE: The Duke of Dominoes)