In general, the stories from the different eras, in and around Neptune City, can be generalized by the following:

• Pulp Era - An era of adventure, excitement and danger. Masked mystery-men, rocket-ships, and scantily clad women menaced by monsters. An era of two-fisted heroes, steel-jawed detectives, flying aces, and jungle heroes set in stories of mystery, horror beyond imagination, romance, spicy adventures, and foreign intrigue.Gangster stories as well as crime fighting belong here as well.
• Golden Age - The superhero archetype is first defined and the heroes who will shape the eras to come are created. It was a simpler time... A time of just causes and vengeance filled characters who had brightly clad costumes and spunky sidekicks at their sides. It is not surprising that this era corresponds with the period before and during WWII.
• Atomic Age - Super Heroes are largely forgotten, as the country (in its new found struggle against Communism) is suspicious of anyone who hides their face behind a mask. This is the era of romance stories, as well as horror, giant monsters, westerns, science fiction, and spy tales. Luckily for the superheroes of Neptune City (and elsewhere) the era goes as quickly as it comes.
  
• Silver Age - Super Heroes return - bigger, flashier and more amazing than ever. The villains get much more flashy, as well, and the plots of stories become more of an ongoing struggle between the villains and the heroes - without the death and dire consequences of the Golden Era. Super Heroes now are taking part in truly amazing stories (outer space, worlds of magic, other dimensions, and so on), and backgrounds and rationale for powers becomes more important.
  
• Bronze Age - This is a continuation, mostly, of the Silver Age. The villains get a little bit more serious, the stories get a little bit more serious, and the heroes get a little bit more serious. In some ways, this era is a return to the Golden Age - not grim and gritty (yet), but still the stories and motives have an edgier feel to them. Real life problems and social relevancy seem to creep into many stories at this time. In the Bronze Age many of the USA-5O stories take place.
• Iron Age - This is the era in which the reputation of the Hero suffered most. Now it is common for heroes who flaunt moral authority, have the power (and often the desire) to kill, and who have lost the black and white sense of right and wrong. Stories in this period are gritty, grim, and full of moral ambiguity. Characters (heroes and villains) quite frequently reflect the mixed currents of what appears to be both right and wrong (and in-between) in society at the time, as do stories set in this time.
• Neo-Silver - The hero has been through the era of losing his moral compass, and has emerged as a champion (once again) for what is right in the world. Although there are the shades of gray and questions about morality from the real world - and these are not ignored - the characters reflect a much more black and white approach of the earlier eras. Stories continue to be complex, and set in amazing settings. The sense of the fantastic and grandiose has returned to the stories of this time.