"Mistaken Identity"
Triangle 1992-17.
Continued from Action Comics (1938) #676, continues in Superman (1987) #67.
With Husque and Professor Hamilton having switched places interdimensionally, Superman and Jimmy hunt for Husque and a way to get the professor back. Upon finding Husque they convince him to attempt the transfer, but he switched places with Flashpoint instead of Hamilton. Flashpoint falls in with the wrong crowd and accidentally assists two arsonists with their mafia jobs.