Marvel Mystery Comics (1939 series) #12

Main Story:
The Search For J. B.

Creators:
Carl Burgos, Bill Everett, Paul Gustavson, Ray Gill, Bob Oksner, Steve Dahlman, Ben Thompson

Cover:
Jack Kirby, Joe Simon

Editor(s):
Joe Simon

Characters:

Plus: Dr. Watson (Monkey), Fen (Princess Fen), Lightning (horse), Philo Zog (Philo Zogolowski), President Franklin Delano Roosevelt (Franklin Delano Roosevelt), Ruth Wilson, Terry Vance, Zar (lion).