"Superman: "The Secret of the Stone-Age Superman"": While on vacation in France, Perry White joins a group of spelunkers in exploring a cave. The cave collapses and the explorers are rescued by Superman but then they discover the skeleton of a prehistoric man wearing a Superman costume.
- Hold it, you heels! This is your last performance!
Synopsis for Superman: "The Secret of the Stone-Age Superman"
While on vacation in France, Perry White joins a group of spelunkers in exploring a cave. The cave collapses and the explorers are rescued by Superman but then they discover the skeleton of a prehistoric man wearing a Superman costume.
In order to solve the costumed skeleton mystery, Superman goes back into prehistoric time. Once he arrives he discovers that the sun is Red and he loses his superpowers. In the meantime Superman runs into a prehistoric thug named Guarr who is exploiting his village by with holding water in exchange for various personal items. Though Guarr's savage upbringing affords him greater strength and durability than the powerless Superman in battle, the man of steel is able to briefly hold his ground with his wrestling techniques. Unfortunately, he is knocked out when he drops his guard and a prehistoric beast arrives on the scene. Unconscious, Superman is rescued by a beautiful young woman named Virra, who becomes infatuated with him.
Taking him to her family's cave, Virra nurses Superman back to health and tells him of their plight. Superman discovers the source of Guarrs water and shows the villagers how to build an irrigation system so they can access the water more readily. He also encourages them to rise up against Guarr and overwhelm him which they do with little difficulty.
Superman is then rescued by the arrival of a Superman robot K-31, the man of steel bidding farewell to Virra as he and his robot return back to the present time, the robot being disguised as Clark Kent. Realizing he has left his costume behind, Superman surmises that it was found by Guarr and he was the Skeleton they had discovered in the cave at the beginning of this story.
Appearing in Superman: "The Secret of the Stone-Age Superman"
- Guarr (Only appearance; dies)
- 20th Century
- Prehistoric Era
Synopsis for Supergirl: "The Anti-Supergirl Plot!"
Linda Danvers is attending a party and watching a band of performers called "The Heroes" who disguise themselves as Green Arrow, Green Lantern, Batman, and Supergirl. However, the band is a front for a gang of thieves that case mansions while their audience is distracted with their solo singer.
After two consecutive instances of a mansion being plundered after a "The Heroes" performance, Linda grows suspicious. As Supergirl, Kara interrogates Kim Lorne, the Supergirl-costumed solo singer, and learns Kim believed her band were honest musicians, but she has just found out they are crooks, and they have threatened to harm her parents if she goes to the police.
Supergirl has the idea to impersonate Kim. Later, during another gig in the Metropolis Atlethic Club, Kara delivers an amazingly good performance as the gang cases the club, and the gang leader "Fingers" Cooley grows suspicious. Later Supergirl attacks them when they are sneaking into the place, but Cooley immobilizes her with a piece of Green Kryptonite stolen during their latest heist. Supergirl accidentally collapses against the light switch and blacks out the room.
The gang turns the light back on and they are going to finish their heist when they are ambushed by the real Justice League. Then Kim takes off her disguise and reveals she noticed the missing piece of Kryptonite when she was looking in their hideout for evidence. Realizing Cooley was setting a trap, she put on her Supergirl disguise and rushed to the Club. She was the one who put out the light and then swtiched places with Supergirl. Supergirl was still too weak to move so the summoned the real JL.
Appearing in Supergirl: "The Anti-Supergirl Plot!"
- The Heroes (Single appearance)
- "Green Arrow"/"Fingers" Cooley
- "Green Lantern"
- "Supergirl"/Kim Lorne
- The Beatles (Mentioned only)
- Carter Hagen (Single appearance)
- The Monkees (Mentioned only)
- Superman (Mentioned only)
- Metropolis Athletic Club
- Rhode Island
- Carter Hagen's home (Single appearance)
- Morbilt Mansion (Single appearance)
- Stanhope College
- "The Anti-Supergirl Plot!" was reprinted in Superman Family #169 and Supergirl: The Silver Age Omnibus Vol. 2
- According this story, Earth-One's sun was red 1,000,000 years in the past.
- Guarr resembles Abraham Lincoln.
- Superman Recommended Reading
- Action Comics (Volume 1)
- Action Comics (Volume 2)
- Adventures of Superman (Volume 1)
- Batman/Superman (Volume 1)
- Batman/Superman (Volume 2)
- Batman/Superman: World's Finest (Volume 1)
- DC Comics Presents (Volume 1)
- Superman (Volume 1)
- Superman (Volume 2)
- Superman (Volume 3)
- Superman (Volume 4)
- Superman (Volume 5)
- Superman/Batman (Volume 1)
- Superman Confidential (Volume 1)
- Superman: Son of Kal-El (Volume 1)
- Superman: The Man of Steel (Volume 1)
- Superman: The Man of Tomorrow (Volume 1)
- Superman/Wonder Woman (Volume 1)
- World's Finest (Volume 1)
- Supergirl Recommended Reading
- Action Comics (Volume 1)
- Adventure Comics (Volume 1)
- All-Star Comics (Volume 1)
- Supergirl (Volume 1)
- Superman Family (Volume 1)
- Supergirl (Volume 2)
- Infinity Inc. (Volume 1)
- Power Girl (Volume 1)
- Supergirl (Volume 3)
- Supergirl (Volume 4)
- Supergirl (Volume 5)
- Supergirl and the Legion of Super-Heroes (Volume 1)
- Power Girl (Volume 2)
- Supergirl (Volume 6)
- Worlds' Finest (Volume 1)
- Supergirl (Volume 7)