Starz unveils Outlander's Season 5 official trailer

"It's so wonderful to be able to play a relationship that keeps growing and growing and deepening and deepening," Caitriona Balfe said Saturday while promoting Season 5 at New York Comic-Con. "That time and the love that they have for each other, it keeps expanding. You don't think it's possible from Season 1, but it really does. They support each other in really tough, tough times."