ACTION COMICS (1938) #771

One fine night, Superman is cruising through Metropolis when he suddenly hears a screem. He strains to find out its source and sees a man falling to his death. Superman kicks into top gear. He arrives just in time to save the man and sees that he is holding an unexpected guest, Nightwing. Nightwing asks Superman to let him down. When Supes aks him what he is doing in Metropolis, Nightwing syas that he is here on a case.…