Today in Comics History, April 12, 1942: First modern appearance of Aquaman of Earth-2, showing up just in time to get retconned out by Crisis*

from All-Star Squadron #59 (DC, July 1986), co-plot and script by Roy Thomas, co-plot by Dann Thomas, pencils by Arvell Jones, inks by Vince Colletta and Tony DeZuñiga, colors by Carl Gafford, letters by David Cody Weiss
*This is exactly what happened.