"Resurrections"
Triangle 1993-26.
Continued from Superman: The Man of Steel #25, continues in Adventures of Superman (1987) #504.
Superman is back, but with four others also claiming the name nobody seems willing to readily believe him. Speaking privately with Lois, he manages to convince her that of all the Supermen, he may actually be the real one.
In what's left of Coast City, Mongul becomes over-zealous about destroying Metropolis and speculates about ruling again. His boasting infuriates the Cyborg Superman and he attacks Mongul, putting him in his place.
With a pair of rocket boots from Team Luthor Kal-El heads off to Coast City with Steel and Superboy.