Frank Randall is Claire's husband in the 1940s era, and when the heroine goes back in time, she is shocked to meet his brutal, look-alike ancestor in Scotland. In the novels, the two are described as being similar, but not identical, with Claire noting that Jack "might have been Frank's brother." She thinks, "There was the same lithe, spare build and fine-drawn bones; the same chiseled lines of the face; the level brows and wide hazel eyes; and the same dark hair, curved smooth across the brow." However, she notes that Jack has longer hair, which he keeps tied back in a ponytail and is tanner than Frank's "light golden" coloring.

Both Frank and Jack are played on the show by Tobias Menzies, making the two probably much closer to identical than they were meant to be in the novels. The series does reflect the differences in their hairstyles but does not account for their variances in skin tone. On the page, Claire notes that Frank is about four inches taller than her, which would make him 5 feet 10 inches. Taking into account actress Balfe's height, Menzies should be 6 feet two inches tall to accurately represent the height difference. Menzies is 6 feet 1 inch, which is close. However, it does mean that he and Heughan are much more similar in height than their respective characters in the books. Menzies' eyes are brown rather than hazel, but otherwise, the actor is a dead ringer for the literary character. He has the same wiry build and a handsome but sculpted face that allows him to play both sweet and sinister.

Show accuracy: 8/10 — Frank and Jack are supposed to be slightly less identical, and both should have hazel eyes, but with Menzies' brilliant acting, we don't mind him assuming both of these important roles.