'Heroes' stars promise darker season

The cast of Heroes have promised fans a much “darker” third season.

Following negative reaction to last year's strike-shortened run, the show's cast have admitted that the upcoming season will see a change in tone.

Speaking to Access Hollywood, Masi Oka (Hiro Nakamura), said: "Some heroes might become villains, some villains might be heroes, who knows?"

Adrian Pasdar (Nathan Petrelli) backed up Oka's statement, adding that the new season would feature characters switching sides.

"I think they want to focus on the people who appear to be heroic and do things for good, who may not be who they appear to be and vice versa," he said.

"This season is going to focus more on the darker side of the heroic coin."