Riddle me this, riddle me that
What do you get when you combine Action Comics #536, Justice League of America #207, and New Teen Titans #23?
The answer? A continuity kerfuffle!
In Action #536, Superman, or rather the non-invulnerable half of Superman separated by Lord Satanis and Syrene and mystically trapped in his own time-period, greets the Teen Titans at the very end, when they materialize in the Justice League Satellite courtesy of Raven. In NTT #23, we learn that the reason why the Titans board the Satellite is due to a failed attempt to breach a Gordanian vessel commanded by Blackfire to save Starfire from her clutches. Raven sheathed herself and her teammates in her Soul-Self, which keeps them alive long enough to get to the Satellite, and an editorial note indicates that the reason the JLA isn't on the Satellite is due to the goings-on in JLA #207. As in Action #536, Superman greets the Titans at the very end. However, in JLA #207, Superman (and a non-mystically-separated Superman with all his powers and the ability to navigate the Timestream under his own ability) departs with the League on a jaunt into the Multiverse and winds up on an altered Earth-Two ruled by a Nazi dictatorship headed by Per Degaton... Ergo, either we concede the editorial note in NTT #23 cannot be correct, in which case JLA #207 must happen either before Action #534 or after Action #541 (the bookends of the Action Comics "Split Decision" story arc; frankly, I prefer the latter chronological placement); or, the more unlikely decision, Superman was briefly impersonated by an identical doppelganger with his exact personality and power set during the JLA adventure while the real Superman was split into two beings, and nobody ever found out.