
#1
Nov 1942
Catalog data from Metron and the Grand Comics Database is licensed CC BY-SA 4.0 and was normalized by The Collector. Cover images belong to their publishers.

#3
Jan 1943
1st appearance of The Trolls
First appearances, origins and turning points, led by the debuts of the characters who appear most across the catalog.

#7
May 1943
1st appearance of Queen of Hearts

#3
Jan 1943
1st appearance of The Trolls

#10
Aug 1943
1st appearance of Demlins [Demon

#4
Feb 1943
1st appearance of Sabbac

#52
Aug 1947
1st appearance of Mrs. Wagner

#90
Oct 1950
1st appearance of Zarro

#62
Jun 1948
1st appearance of Mr. Hydro

#63
Jul 1948
1st appearance of Killer Bane

#18
Apr 1944
1st appearance of Professor Vultur

#70
Feb 1949
1st appearance of Mite the Sprite

#71
Mar 1949
1st appearance of Queen of Shades

#73
May 1949
1st appearance of Hakir
Who made the most issues of this run, with the issues they span.
Who appears most often in this run, by issues they appear in.
Characters who debut here, led by those who appear most across the catalog. 37 in all.
Information on Fawcett Comics' annual sales of Captain Marvel Jr from 1942 to the mid-1950s is taken from the book "Juvenile Delinquency" (from 1950).
CIRCULATION DATA 1942 - 618,367 1943 - 4,395,907 1944 - 5,245,696 1945 - 4,069,797 1946 - 4,439,413 1947 - 3,973,738 1948 - 3,992,980 1949 - 3,287,756 1950 (First 6 months) - 1,471,435
From the Grand Comics Database.