Far from it, Red! These people are much further advanced in knowledge of electricity than we are today! He was able to de-materialize an entire city by dissolving its electrical protons! Only for one day ever thousand years, when the geyser erupts again, does the city appear! To its inhabitants a thousand years is no more than a day! 
Captain Marvel, Jr. #106 is an issue of the series Captain Marvel, Jr. (Volume 1) with a cover date of February, 1952.
Synopsis for Capt. Marvel, Jr.: "Capt. Marvel, Jr. and The City in the Mirage!"
While traveling across the Mojave Desert, Freddy Freeman and Red O'Riley encounter a geyser whose eruption brings an entire city into existence! When the city's mysterious ruler, Dakmore, comes across the two, he mistakes them for barbarians and seeks to have them captured, only to meet with the might of Captain Marvel Jr.
After a brief battle, the World's Mightiest Boy and his friend learn of how this city existed 138,000 years ago, and about how Dakmore used the Protonic Disassembler to save the city from a coming ice age by timing it to the next eruption of the geyser, resulting in the city disappearing and then reappearing again every thousand years when the geyser erupts. But upon learning from Captain Marvel Jr. and Red O'Reilly that the world has been repopulated since the ice age, Dakmore reveals his intent to conquer the world, shortly before he uses the Proton Attractor to trap Captain Marvel Jr. and his friend as he gathers a robotic army.
Upon resisting the Proton Attractor and turning it off, Captain Marvel Jr. descends on Dakmore's robotic army and turns it into so much scrap before confronting Dakmore himself, who threatens him with a miniature version of the Proton Disassembler. Captain Marvel Jr. survives the blast of the weapon and knocks it out of Dakmore's hands, but Dakmore is not so lucky, as he is hit by the blast himself and fades away to nothingness.
Soon after, Captain Marvel Jr. and Red meet with the councilors of the city, who opposed Dakmore's dreams of world domination, but feared his power. They take over rule of the city, and as the geyser begins to wane, they bid Captain Marvel Jr. and Red go before the city vanishes again, which they promptly do.
Appearing in Capt. Marvel, Jr.: "Capt. Marvel, Jr. and The City in the Mirage!"
Featured Characters:
Supporting Characters:
Antagonists:
- Dakmore
- Dakmore's Robotic Army (Destroyed)
Other Characters:
- Geyser City Councillors
Locations:
- Earth-S
- New York City
- Mojave Desert
- The City in the Geyser Mirage
Items:
- Protonic Disassembler
- Proton Attractor
- Miniature Protonic Disassembler
Vehicles:
- Red O'Riley's Car
Synopsis for Capt. Marvel, Jr.: "Capt. Marvel, Jr. -- Two-Headed Boy!"
Professor Edgewise uses a green ray on a lamp that makes it have two heads on it, his Amoeba-Ray (because it splits things like them) in a demonstration to fellow scientist, Prof. Knort. He complains that it doesn’t split things entirely into a second copy, but Prof. Knort decides that this is a crackerjack idea, so he’s going to steal it. Later, he puts on a green suit, ties a red scarf over his face and blackjacks Prof. Edgewise to steal the Amoeba-Ray. Luckily, Freddy Freeman is in the same locker room where Prof. Edgewise is putting his things and calls CAPTAIN MARVEL to become Captain Marvel, Jr. To escape him, Prof. Knort fires the Amoeba-Ray at him, giving Captain Marvel, Jr…. Two heads! What’s worse, one of his head decides that this is way too embarrassing to be seen in public. Prof. Edgewise wakes up and figures out that one of his heads is reflecting a more “sentimental” side of him, something Junior is not known for expressing. To try to make the Sad Head less upset, Junior fashions a small barrel they can fit over the second head. He soon checks in on some of Prof. Edgewise’s associates and overhears Prof. Knort talking about how rich he’s going to be. He asks him where the invention is and Knort already knows it’s the Amoeba-Gun (he claims he saw it before it was stolen) and Junior points out he has a bandage from where he hit him earlier and his globe has two globes on it. He quickly punches out Prof. Knort and finds that the Amoeba-Ray has a reverse function, fixing his head back to normal. Later, Freddy says that Prof. Knort went to jail and Prof. Edgewise, naturally, forgot about his invention altogether.
Appearing in Capt. Marvel, Jr.: "Capt. Marvel, Jr. -- Two-Headed Boy!"
Featured Characters:
Supporting Characters:
Antagonists:
- Professor Knort
Other Characters:
Locations:
Items:
- Prof. Edgewise's Amoeba-Ray
Vehicles:
Synopsis for Capt. Marvel, Jr.: "Capt. Marvel, Jr. and The World's Greatest Salesman!"
Appearing in Capt. Marvel, Jr.: "Capt. Marvel, Jr. and The World's Greatest Salesman!"
Featured Characters:
Supporting Characters:
Antagonists:
- Mr. Robbins
- Mr. Gorem
Other Characters:
- Alligators
Locations:
- Earth-S
- New York City
- The Electrical World's Fair
- A Modern Igloo City
- Alligator Swamp
Items:
Vehicles:
Notes
- "The City in the Mirage" is reprinted in Shazam! Vol 1 21.
Trivia
- The issue also contains the text story "Blood on Mr. Blank" by John Martin, and comic strips of Kanvasback, Judge Smudge, and A Boiled Up Cook.
See Also