Jason, Tim, and Damian are all fighting a new villain in Gotham City, the self-proclaimed "Time Twizzler." Something goes wrong and they are teleported back in time to the headquarters of the original Young Justice team, Mount Justice. What happens when they see their big brother Dick Grayson, young again in his Robin suit and with his old team? And what will the team think of these vigilantes that just broke into their secret headquarters? And why do they act like they know Robin?