Here's even more from Limited Collectors' Edition C-45 of June-July, 1976, under another wonderfully evil cover by Dick Giordano.
This time around, its the foes of Batman, Flash, Superboy/Superman and Wonder Woman that get covered....specifically Catwoman, Mirror Master, Mr. Mxyzptlk and the Cheetah!
Catwoman is broken out of jail by the mysterious Mr. X to help in his planned crime spree. Along the way, Catwoman encounters Batman, but saves him from a collapsing wall, with her receiving a knock on the head. Catwoman claims the 1950 calendar is ahead of time...and wonders why she is in costume, after all she is just stewardess Selina Kyle. Batman deduces she had amnesia, and works with her as she recalls a planned meeting with Mr. X. Catwoman works with the dynamic duo to capture Mr. X, and after doing so, Catwoman vows to retire from the costumed life.
Thankfully she did not....
Ex-con Sam Scudder goes into a bank, to capture an image of one of the tellers. Appears while serving time, Scudder made a mistake making a mirror, learning how to keep a reflection in one. He continued experimenting with mirrors, making images that he could command, making himself a Mirror Master. Scudder used this ability to rob banks in Central City, coming into conflict with the Flash, who followed one of his images home, and, after a battle with some of Mirror Master's illusions, the Flash took Mirror Master to jail (so Barry Allen could make his lunch date with Iris West).
Mirror Master would return again and again to face the Flash.
Mxyzptlk started as a mischievous little boy that vexed his 5th Dimensional parents of Fuzastl and Tlndsa, so, he ran away to Earth-1, encountering Superboy in Smallville, thinking it would be fun to turn the town against the Boy of Steel. The boy prankster even enrolls in Smallville High, meeting Clark Kent, and accidentally revealing to Clark his color blindness. After a few attempts to sabotage Superboy (which Clark turns to his advantage), Superboy finally uses what he has learned to get the imp to say his name backwards and go home.
Mr. Mxyzptlk never forgave Superboy for this, and would return again and again to torment the Man of Steel.
Debutante Priscilla Rich is outshone by Wonder Woman a few times, and decides to plot revenge against the amazing amazon. Priscilla manifests an alter ego, the Cheetah, and garbs herself to look like one. stealing charity money with the intent to frame Wonder Woman for its theft. Cheetah fails in this, ending up trying to kill Wonder Woman in quicksand, then a fire, with Wonder Woman nearly figuring out her identity as it appears the flames take the Cheetah.
But, the Cheetah would return.
Captain Boomerang, Vandal Savage, Scarecrow, Matter Master, the Shark, Bizarro No. 1, Penguin, Solomon Grundy, Giganta, Grodd, Brainiac, Two-Face, Felix Faust, Queen Bee, the Top, Pied Piper, Sonar and Kanjar Ro), another feature on the many costumes of the Catwoman, and, on the last page, "Every Hero's Enemy"...that of Dr. Light, making this and the other DC villains' treasury an indispensable guide for every villain fan of from the 1970s!