Superman: Time and Time Again part 1

This 7-issue story arc wound between the three Superman books at the time - Adventures of Superman, Action Comics, and Superman (in that order) - for just over two months. To set the stage, Clark Kent has just revealed his secret ID to Lois Lane, and she's not sure what to make of their relationship following this revelation.

The Legion of Substitute Podcasters talk about it in episode 578.

This story arc was later reprinted in trade paperback as "Superman: Time and Time Again".

Adventures of Superman 476: Time & Time Again, part 1 of 7 (on sale 1/29/91)

• A time traveler called the Linear Man appears, and sets off an alarm that brings Booster Gold to Metropolis. The Linear Man is looking for Booster because he has violated the natural laws of time for his own selfish means, and it’s his duty to bring him back. In trying to stop him, Superman accidentally grabs his time controls, which opens up a hole in the time/space continuum. Superman and the Linear Man get sucked into the portal, leaving Booster behind. Superman wakes up surrounded by a fire (where his cape gets burned away). He arrives in the 30th century on page 17, and we see the rest of his meeting with the Legion from his perspective.  
• Page 22: Superman mentions that he’s met Brainiac 5, Blok, Sun Boy, and Invisible Kid, referring to Superman #8 & Action #591, which is his past but the Legion’s future. Saturn Girl says she recognizes some of those names, meaning all but Blok since the other 3 joined very early in the Legion’s time (all before Adventure 300).
• When this was published in 1991, the Legion’s appearance here was supposed to be the Silver Age version of the 5YL Legion, because that’s what was being published at the time. But after the Reboot, in Legionnaires 61 (1998), we see this exact scene from the perspective of the Legion (instead of Superman), and it’s presented as the Reboot Legion instead of the 5YL Legion with some shenanigans caused by the Time Trapper. Roger Stern was a writer on the Superman titles of 1991 and also the Reboot Legion, so he repurposed the scene to keep the rebooted continuity intact.

Action Comics 663: Time & Time Again, part 2 of 7 (on sale 2/5/91)

• Flashback to part 1 for those who don’t read Adventures of Superman. Superman asks the Legionnaires to tell them about his future, to make sure he did return after this. Saturn Girl says their records are spotty, but before she can continue, the fire (from earlier) blows up again and Superman is transported back in time to WWII. He wakes up and is taken by a bystander to the nearby circus, because his costume looks like that’s where he belongs. He’s having trouble seeing, but he finds out that he’s in 1943 and decides to stay with the circus until he gets better. His act is Samson, the strong man, where he breaks chains and lifts elephants. He spends 2 months there. Meanwhile, back in Metropolis, Booster says he knows some people who might be able to help find Superman. Superman leaves the circus and goes to Metropolis where he saves FDR, who tells him that he should join the Justice Battalion. Superman goes off to Washington to find the JSA, but the Spectre stops him, saying it’s too early for him to meet the JSA. Spectre sends him to a train station in Nazi-occupied Warsaw where he says Superman is needed.

Superman 54: Time & Time Again, part 3 of 7 (on sale 2/19/91)

• June 1943, Superman is spotted by the Nazis but leaves. Nazi General Zeiten captures the soul of a Jewish prisoner in a magical crystal. Superman flies to the Warsaw Ghetto, where he overhears the Nazis talking about using the Jews as test subjects for their atomic experiments. Superman recognizes the general as someone he’s met before, “Mister Z” (Superman #51), and wrecks the experiment lab and stops a train carrying the Jews. The Nazis drop their bomb anyway, but Superman catches it and takes it out of the atmosphere. The explosion causes him to disappear.

Adventures of Superman 477: Time & Time Again, part 4 of 7 (on sale 2/26/91)

• Page 7: Wildfire is a new member who hasn’t had a chance to read up on Legion history, which suggests that this takes place circa Superboy 201 when he joined (in the comments to our podcast episode, David Spofforth says "If I had to nail down an exact placing for the sun eater episode, I’d put it precisely between Superboy 202 and 203. Wildfire didn’t get his new name until 202 and the non-reaction to Superman’s mention of Invisible Kid means it should go before one Invisible Kid’s death in 203"). That sounds good enough to me! Per the Sourcebook timeline, this was in June 2981; the Linear Man says that Superman came out of the time stream about 7 years too soon, and the closest thing in Legion history (5YL version) to that would be Glorith’s destruction of Daxam in January 2988 (as seen in LSH v4 Annual #1); in pre-5YL history, that would probably be the revival of the Infinite Man and the battle with the Time Trapper (as seen in LSH v3 #50) in February 2988.
• Page 14: Superman says he just met Garth “a couple of days ago” but recall he spent 2 months in the circus in 1943 right after that.
• Page 20 panel 1: this is clearly the Cockrum-era Legion, since the cruiser has a small bubble up front and not the big bubble over the whole saucer section like it was under Grell; also, notice that Wildfire’s faceplate goes down underneath his chin, which was how Cockrum drew it, as opposed to how Grell drew it ending above the chin.
  

Coming soon: why are we interrupting the LSH v4 Five Years Later with a Superman story arc that only guest-stars the Silver Age and Bronze Age Legion in only some of the chapters? Long story short: events in T&TA have a direct and major impact on the Legion v4 series going forward. You'll have to wait to see how.