Superwomen of Yesterday, Today and Tomorrow

While the greatest superhero on any world is Superman, the woman... or rather women... behind him goes by the name of Lois Lane. And, on rare occasions, as Superwoman!

Of course, there are the preeminent superwomen in the Supermen's Kryptonian cousins of Kara Zor-El and Kara Zor-L aka Supergirl and Power Girl who would each take up the mantle in one form or another upon reaching womanhood. Then there was Kristin Wells from the 29th century who claimed the name of Superwoman in the late twentieth century, while her counterpart Maria remained in that far future era with her sinister technological twin taking her place.

Then there was the nasty Amazon of Earth-Three known as Superwoman, Wonder Woman's counterpart, who was the sole female member of the Crime Syndicate and found herself exiled in interdimensional limbo with her cronies for years after facing the Justice League and Society on two occasions.  She perished along with her world during the Crisis on Infinite Earths, while trying to save it.

Of course, the most famous Superwomen briefly adopting that alias were the Lois Lanes of Earths One and Two, although their careers were extremely short. For Lois-One, this was when her boyfriend made a device that transferred his Kryptonian powers for a limited period of time to her. For Lois-Two, this occurred when her husband's Kryptonian abilities transferred to her temporarily due to an exotic extraterrestrial plant he had bought her.

In the 30th century, the apparent descendants of both Supermen and Lanes followed in their ancestors' footsteps. Lois 4XR whom Superman met after being sent to the year 2961 by Lex Luthor using technology provided by the Legion of Super-Villains member Cosmic King. 

The Earth-One Lois 4XR had a counterpart in Lois 4XR of 2949 on Earth-Two. Both of these Lois's seemed to have all the powers of their ancestors at the peak of their prowess, however with none of the good judgement or discipline. As such, a grown Superman had to rescue Lois 4XR several times before he returned to the 20th century. Laurel met the teenage Superboy while he was meeting up with his Legion allies. The Boy of Steel initially fell for her before learning her identity, and then returning to his native time knowing that this girl would resemble the woman he would one day marry. 

Laurel Kent was a student of the Legion of Super-Heroes' Academy, due to her young age and that the sole superhuman power was invulnerability. Her mother seems to have been Lois 4XR, whom Superman met years before his earlier self as Superboy had met Laurel.

Jor-L was Laurel’s Earth-Two doppelgänger, an ace agent of the Space Legion. As one of the Federal Men of the 30th century, he was noted for bringing to justice the Bandit Queen, Nira-Q. In the end, it was Jor-L who triumphed.... as witnessed by a 20th century inspiration for the Federal Men in Steve Carson

Later stories seem to indicate in on future timeline that Laurel was in actuality an android agent of the Manhunters originally built by the Guardians of the Universe, sent to infiltrate superhuman societies in the 30th century.