The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Third Series, Vol. 1, Part 2, Nos. 1&2, Periodicals, 1946-1947.
Captain Marvel [Billy Batson]; Mr. Ajax; Maxwell; J.C. Barnes
Synopsis
Captain Marvel invents an atomic airplane motor and takes it to the Ajax Aircraft Company for testing, but the president of a rival company sabotages the test and steals the plans.