Time Loop

"So you are telling me that everyone in this world is stuck in a Time Loop; like only one year repeating again & again" "Thats the gist of it" "What do we do about it then?" "We correct it, unless we want the world to end" "And we can do it?" "Yeah, Ofcourse" Where our heroes take on a different kind of threat, with allies- old and new. How will they overcome this untimely threat?