While it followed the comics, it played out poorly in the animated show
Still a decent show though I guess. Just the people of Metropolis made me rage on their stupidity.
So for the end credits, I guess we'll be seeing for the next Justice League animated movie:
The first half of the Reign of the Supermen! story focuses on each of the Supermen “resuming” his duty as protector of Metropolis and gaining acceptance from the public. Of the four, the reader very quickly learns that neither the cloned Metropolis Kid nor the John Henry Irons Man of Steel are the real Superman. The Cyborg Man of Tomorrow and the Last Son of Krypton were easily bought in by the people as the possible real Superman, since Lois questioned both of them, and both recalled memories which Clark Kent had. Cyborg was even tested by Dr. Hamilton who stated that the Cyborg appeared to be the real Superman.
In actuality, the Last Son of Krypton stole Superman's body and put it in a regeneration matrix in the Fortress of Solitude, drawing on his recovering energies to power himself, as bright light blinded him. It is revealed that the Last Son is the Eradicator, an ancient Kryptonian weapon, and the Cyborg is the deranged consciousness of Hank Henshaw, which used Superman's birthing matrix to create a physical duplicate of his body.
The regeneration matrix broke open, and the original Superman emerged, greatly depowered, but alive. Meanwhile, the Cyborg helped Mongul destroy Coast City, believing he killed the Last Son in the explosion, and captured Superboy, holding him in Engine City, a towering construct erected where Coast City once stood. Superboy escaped and flew back to Metropolis to get the Man of Steel to help him fight the Cyborg. Before he could tell the whole story, however, an overbearing Kryptonian Battlesuit rose out of the harbor, and the two heroes attacked it.
After suffering heavy damage, the suit opened, revealing a still-weak Superman, who had used it to walk all the way back from the Fortress of Solitude. Despite his weakened state, he quickly joined the other Supermen in defending Coast City. Upon his revelation, he acknowledged himself as the real Superman (the fifth person at this point to claim that title). When asked by Lois Lane what made him any different from the other Supermen, he responded with "How about... To Kill A Mockingbird?" (Clark Kent's favorite movie, and something he shared with only those closest to him). Though she remained hesitant, Lois mentally acknowledged that this was something only the real Clark Kent would know.
During the battle of Coast City, the Cyborg launched a devastating missile at Metropolis, with the intent of destroying it and putting a second Engine City in its place. Superboy managed to grab onto the missile as it launched, riding it all the way to Metropolis, which he narrowly saved from destruction.
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Just no Supergirl of course.