Guest Stars Seana Kofoed as Commander Carla Chase Mahina Napoleon as Julie Tennant Moses Goods as Wally Holman Sharif Atkins as Norman 'Boom Boom' Gates Enver Gjokaj as Captain Joseph Milius Mark Gessner as CGIS Special Agent Neil Pike Danielle Zalopany as Hina Linc Hand as Charlie 1 Ethan Rains as Dr. Adrian Dunne Izabella Miko as Alina Nikitin Billy Boyd as Colin McIntyre Co Starring Sam Bass as Hulking DSS Agent Mary Thornton as Major Lydia Vail Mark Wilson as State Department Official Nicholas Bonanno as Commander Thomas Kelley