The Origin of Madame Time

Your time-powers manifest the moment before a nuclear explosion will kill all of the heroes and villains battling in the abandoned amusement park (where you'd been observing as the plucky reporter that you are). Time is frozen for everyone but you and you need to figure out how to save everyone, aided by your aftersight (seeing the past of your location) and foresight (seeing a future event).

Everyone else being frozen, there's no personal interaction with the characters, but there's still characterization in the form of the situations you find them in (and your own notes in your reporter's notebook), making for a fun implied setting and cast.