SUPERMAN 200 (October 1967)--"Super-Brother Against Super-Brother" by Bates and Boring; cover art by Swan and Klein:
In this imaginary story, it's Kryptonopolis not Kandor that Brainiac abducts and puts in a bottle on board his spaceship. The living computer is doing this for a good cause. His world has sent him on a mission of good will. After rescuing Kryptonopolis, it's his intention to save other cities from the doomed planet, but time runs out.
Good ol' Brainiac pays occasional visits to the El family inside the bottle. At the naming ceremony for their second son, as godfather, he chooses the name Knor--after the man who designed his brain circuits. As Kal-El and Knor-El grow up, the elder brother shows an aptitude for science, while his kid brother is athletic.
Brainiac succeeds in bringing Kryptonopolis to Earth, but dies in the effort and is celebrated by the people as their great hero. There is a limited amount of ZN-4 gas to enlarge one of them, so it's decided to select one citizen who will go outside of the bottle and gain super-powers under the yellow sun and lesser gravity.
A contest is held to find the champion who will leave the bottle city. It comes down to brother against brother--Kal-El vs. Knor-El. The younger brother wins and leaves Kryptonopolis to adopt the alias of Clark Kent, reporter for the Daily Planet in Metropolis, where he is also known as Superman.
However, when a spaceship of alien invaders, led by the Supreme One, lands on Earth, they render Superman unconscious with a sample of green Kryptonite.
When Jor-El can't find Knor-El on his monitor screens--Kal-El uses a synthetic form of ZN-4 gas he's made to leave the bottle city and enlarge himself, so he might search for his brother. The alien invaders expose him to more green K., which causes him to become a giant and he's able to destroy the entire invasion force. It turns out, in this imaginary reality, that green Kryptonite is like the red stuff in regular continuity. The isotope used on Knor-El knocked him out, while the sample used on Kal-El made him grow in size temporarily.
Now that Kal-El is also at regular human size, rather than joining his brother in Metropolis, U.S.A., he goes to Montreal, Canada, where he works as reporter Charles LeBlanc at the Montreal Star and serves as Canada's super-hero, Hyperman.
The final panel shows Kal-El as Hyperman flying over the geodesic dome at Expo '67 (this was actually the United States Pavillion, designed by Buckminster Fuller).
The caption at the end says:
As we celebrate our 200th issue, Canada is celebrating its 100th anniversary as a united federation. This is our tribute to our neighbor to the north!--Ed.
Note: In point of fact, Canada is a confederation not a federation as the editor erroneously stated.