I really wish I had lots of wonderful things to say about the story in Adventure 329 (Feb 65), but about the best review I can give Jerry Siegel’s story is that it’s not awful, and occasionally amusing.
The tale starts off by reminding the reader that the Time Trapper is still out there, and Mon-El, Superboy and Ultra Boy have a lot of determination to break that Iron Curtain of Time, if no success at it.
Brainiac 5 reveals the new Legion flight rings, replacing the ugly flight belts that had been seen in previous issues. This story does not connect it with the anti-gravity metal invented by Mon-El a while earlier, but later continuity would link the two.
At first the ring simply enables flight, through mental control, but as time passed it would be modified to include communications and monitoring abilities.
A Bizarro Superboy appears, wanting to join the Legion, but is turned down. This is an entirely new character, not any of the Bizarros that have appeared before, and he never appears again after this story.
He returns to Bizarro World and uses the Duplicator Machine to create a Bizarro Legion of his own.
The rest of the tale is Bizarro wackiness, although it does build to a climax as they threaten Superboy, demanding that he turn diamonds into coal. This impossible task is achieved thanks to Element Lad’s transmutation abilities.
The Bizarro Legion does not appear again, but a different Bizarro Legion is created in the Reboot Legion (post-Zero Hour).