I loved the team-up comic titles when I was growing up in the 70s. These books teamed A-lister super-heroes with monthly guest-stars. There was Marvel Team-Up which paired Spiderman with monthly co-stars and Marvel Two-in-One which did the same with the Thing. There was Brave and the Bold over at DC which teamed Batman with other heroes throughout the multiverse and DC Comics presents which did the same with Superman.
I especially liked the annuals of DC Comics Presents, the first of which teamed the Man of Steel with his Earth-Two Golden Age doppelganger as they fought Ultraman of Earth-Three. The third annual teamed Superman with Captain Marvel, his Earth S counterpart. It was interesting that these two would team up since decades earlier National Periodical Publications (now DC Comics) sued Fawcett (owners of Captain Marvel) for copyright infringement because Captain Marvel seemed too much like a Superman knockoff. DC has now had the rights to Captain Marvel for over 40 years, having purchased Fawcett's super heroes.
I recently picked up the second Annual at a comic show for one dollar. It guest-starred a female derivative of Superman called Superwoman. The story is juvenile by today's standards, written by Elliot S! Maggin. The art by Pollard and DeCarlo is passable. I will say, to the story's credit, that the mystery of Superwoman's secret identity kept me guessing through most of the book, though I should have figured it out. The resolution of a mysterious sub-plot regarding Superwoman's genealogy was one I didn't see coming at all, but again, I should have.
The alter-ego of Superwoman in this comic hasn't been the only character to wear the Superwoman moniker throughout DC's history. The first was Lois Lane beginning in 1943. Lois would either gain super powers temporarily, or in a dream, or in an imaginary tale, or in an alternate reality created by Mxyzptlk magic. A more recent story with Lois as Superwoman was in All-Star Superman #2. Another Superwoman was Luma Lynai of the planet Staryl.
The Superwoman of Earth-Three has the alter ego of Lois Lane and the Amazon powers of Wonder Woman. She is part of the villainous Crime Syndicate. She is the most mainstream Superwoman in the current DC multiverse.
Another Superwoman, Laurel Kent, resides on Earth-11, a planet of reversed-gender characters. She appeared in Superman/Batman #23 (2005) and in Countdown Presents: The Search for Ray Palmer: Superwoman/Batwoman one-shot.
In the post-crisis pre-52 universe, Dana Dearden, an obsessed Superman fan temporarily became a Superwoman through the power of stolen artifacts. Lucy Lane had taken on the role of Superwoman for a short time in that same universe.