...this time around, the second and third issue of the 1970s series of reprints, this time around, featuring Supergirl, Green Lantern, Atom, Wonder Woman and Wildcat from April-May and July-August of 1973 with covers by Nick Cardy.
Many details were added to the origin, such as the name of the city (Argo City), her mother, (Allura) and much of Supergirl's later movements to become a credited heroine (as well as her adoption by the Danvers, and even finding her original parents alive....many details also covered in the Supergirl giants of Action Comics).
Hal soon adopted a mask, and even an oath for recharging his ring (which gave him the power to create green constructs, fire beams of energy and fly, with a weakness to yellow), but details of other parts of his origin (such as why he made the mask, the reason for the oath, and those who administered the Green Lantern Corps, the Guardians of the Universe), came later, as show in the Secret Origin reprinted in the 1961 Secret Origins (as well as how there was a previous Green Lantern, Alan Scott, but these details came in later issues, and a few details were given about them in text in this issue by E. Nelson Bridwell).
Ray and Jean took some students spelunking (to take Ray's mind off his failing experiments, though he took along the White Dwarf lens), getting trapped in cave with no way out....Ray used the lens and sunlight from a small hole to shrink, then climbed the wall (smooth to a normal sized human) to cut a bigger hole, for Jean and the students to escape, but Ray safely regrew after accidentally walking under the lens again (which had cave water dripped upon it).
This led Ray to become the hero, the Atom (and the letters' page gave a little more detail, as well as a little more history of the other, Golden Age Atom, and this tale had been previously presented in the More Secret Origins Giant of 1965).
More details were given over the first few issues of Sensation Comics and All-Star Comics #8 of how Diana became Wonder Woman (and got her lasso), but this was all condensed here to make one flowing story.
Ted, now on the run, hear a kid talk of the heroic Green Lantern (the original) and his origin (from a comic), and decided to become a hero himself, somehow making the Wildcat costume, finding the framers, and clearing Ted Grant's good name. Ted Grant still fights crime as Wildcat, sometimes alone, or with the rest of the Justice Society of America, of which he became a member.
Check back here for more of this run of Secret Origins with Nick Cardy covers and facts by E. Nelson Bridwell, including origins for Vigilante, Kid Eternity, Spectre and the Legion of the Super-Heroes.