Dunne — whose lengthy film resume includes After Hours, An American Werewolf in London, and Dallas Buyers Club — comes aboard in a recurring role, and it’s a highly intriguing one at that. He’ll play the present-day version of Nicky Pearson, the troubled little brother of Jack (Milo Ventimiglia) who was believed to have perished in the Vietnam War but was revealed at the end of the fall finale to be alive and living in a remote trailer in Bradford, Penn., just a few hours from the home where Jack and his family lived. The gentle-natured Nicky (the younger-adult version played by Michael Angarano) wasn’t cut out for battle, and when the horrors of war started breaking him down and rotting his soul, Jack enlisted so he could try to save his brother, who was self-medicating with a variety of intoxicants.