"Blackout, Part 3 of 5: Mismatch"
Triangle 1991-39.
Continued from Action Comics (1938) #671, continues in Superman (1987) #62.
Riots and looting continue in Metropolis while Luthor tries to restore power to the city. Superman and Mr. Z are captured by a local cave dwelling tribe on the mysterious island as Lois and Emil travel to the South Pole with Guardian in an effort to find Superman.