'Captain America' sequel to revisit World War II setting?

Captain America 2 could revisit the title character's World War II-era roots, according to the movie's writers.

Scribes Chris Markus and Stephen McFeely told MTV that the sequel could potentially explore gaps in the timeline of The First Avenger.

"The span of [Captain America: The First Avenger] is about two or three years, and there's a few times in the film where you jump four months ahead, you jump six months ahead," said McFeely.

"So we did that with the intention of saying, 'OK, there are certainly unseen adventures that Captain America went on in that period that if we want to, we can go back and explore later.'"

The First Avenger ended with Captain America awakening in the present day Marvel Universe, having been frozen for decades.

Markus added that Steve Rogers's modern-day love interest Sharon Carter, could feature in the follow-up. Carter, who also under the alias Agent 13, is a relative of Hayley Atwell's Sharon from First Avenger.

"I want both of them," he said. "Sharon is meaty, almost to a point where you get a little uncomfortable because her relation to Peggy has shifted over the years, as time has passed… You have to walk a fine line there because it does seem like you're dating your girlfriend's daughter."

Chris Evans will reprise his role as Captain America for Marvel's superhero team-up movie The Avengers, slated for release next summer.

Watch the Captain America: The First Avenger trailer below: