After getting married and beginning a family, Gustavson began working for another comics packager, Funnies, Inc., which supplied publisher Martin Goodman with the contents of "Marvel Comics" #1. The packager also supplied Centaur Publications, for which Gustavson created A-Man, the Arrow, Fantom of the Fair, and Man of War. Other notable work includes humor features in five early issues of DC's "Action Comics", starting with issue #5 (Oct. 1938), and the two-page humor piece "Major Bigsbee an' Botts" in the oft-reprinted "Batman" #1 (Spring 1940).