Issue Cosmic Boy 1 of 4 (Legends chapter 4)
Subtitle Those Who Will Not Learn the Lessons of History...
Date December 1986
Writer(s) Paul Levitz
Artist(s) Keith Giffen, Ernie Colon, Bob Smith
storyline Cosmic Boy (of the Legion of Superheroes) arrived in New York City during the time of the anti-superhero movement. He fell unconscious; Night Girl saved him from an angry mob. He woke up in their hotel room wondering why Superman didn't recognize him - they'd known each other when he was Superboy (though that was from another past / future).
They got some time appropriate clothes and checked out some video - it appeared that there had never been a Superboy. The more "history" they viewed, the more they realized it had all been rewritten. In attempt to make things right for their own future, Cosmic Boy saved an orbiter that was being launched. Something had gone wrong and it was set to self-destruct. When he landed it safely, he was placed under arrest. He escaped as they opened fire.

Issue Cosmic Boy 2 of 4 (Legends chapter 8)
Subtitle Is History not Destiny?
Date January 1987
Writer(s) Paul Levitz
Artist(s) Keith GIffen, Ernie Colon, Bob Smith
storyline Cosmic Boy was blamed for the failed launch of the orbiter. He and Night Girl continued to search for answers - the events of the "past" were all different from what they'd studied in the future. They went to Houston to investigate the equipment he'd saved. When they got on site, they were met by a man named Jason. He thanked Cosmic Boy for saving the device; he designed it. He felt that the failure was accident, not sabotage.
A riot - much like the one at the launch site - erupted outside. Cosmic Boy and Night Girl stopped it and flew off.

Issue Cosmic Boy 3 of 4 (Legends chapter 13)
Subtitle Past, Present, and Future
Date February 1987
Writer(s) Paul Levitz
Artist(s) Keith GIffen, Ernie Colon, Bob Smith
storyline The two Legionnaires hopped into their time bubble and headed home. En route, their bubble crashed into something in the time stream and they landed back in 1986. They went to Jason Krinnski for help in repairing their vehicle. After repairs, they headed out again, only to fail a second time. A third attempt was made, this time with Cosmic Boy using his own magnetic powers to break through the time barrier.
It worked. Too well. They headed past their on present, into the future, all the way to the end of time. There, they stood before the Time Trapper.

Issue Cosmic Boy 4 of 4 (Legends chapter 20)
Subtitle Time Without End
Date March 1987
Writer(s) Paul Levitz
Artist(s) Keith GIffen, Ernie Colon, Bob Smith
storyline The Time Trapper gave his captives 60 minutes to get home. If they didn't, they'd serve him for all eternity. They fought through his best and he allowed them to leave. As they did so, he vowed it would be the last time they traveled through time.
The Time Trapper watched with his captives - Superboy and Krypto.

Notes, references to time, and chronology:
This takes place with two Legionnaires "vacationing" during the time of the Legends event.

   
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