Originally Posted by spideymouse
It probably won't happen if this series takes place after the events of the Avengers.
It can if there's a framing device around them so that someone is retelling events and it expands upon them. Or even without someone retelling, it could still say "6 months earlier" etc. They do that with lots of shows. Heroes had episodes set in the past occasionally. Even Arrow shows Oliver Queen's time on the island every week even though that happened 5 years ago before the present day in which it is set.