sentences:  Later stories were produced by G. T. Fleming-Roberts (born George Thomas Roberts, 1910-1968), Emile C. Tepperman (1899-1951) and Wayne Rogers (pen name of Archibald Bittner (1897-1966).In the stories, the true identity of Secret Agent X is never revealed.He is a master of disguise, known as "the man of a thousand faces", who adopts several different identities in each story.