Sam Heughan and Graham McTavish's friendship extends beyond Outlander, with two co-authored books, "Clanlands Almanac" and "Clanlands: Whisky, Warfare, and a Scottish Adventure Like No Other," and two seasons of their travel show, "Men in Kilts." Their bond, mirroring their on-screen characters, began on the Outlander set, with McTavish describing Heughan as incredibly friendly and supportive. Let's watch the video to see more of their heartwarming friendship and the cast's impressions of Heughan!