Inside front cover.
Only appearance of the "Science Fights Crime!" feature.
formerly Electro; probably changed due to Timely's Electro from MARVEL MYSTERY COMICS. In some panels (but not all), Dynamo's costume still has an "E" on the front above the lightning bolt.
Patterns intended to be traced on cardboard, cut out and assembled into a plane.
Patterns intended to be traced on cardboard, cut out and assembled into a locomotive.
Page count correction by Len Wolinsky via error report.
Ad for Fox's five main anthologies, featuring a drawing of a cannon plus miniature reproductions of the covers to Wonderworld Comics #11, Mystery Men Comics #8, Fantastic Comics #4, Science Comics #1 and Weird Comcis #1. Inside back cover.