In the fourth episode of Outlander, Jamie Fraser's son, William Ransom, who is unaware of his true parentage, becomes a redcoat in the American Revolution. Actor Charles Vandervaart, who plays William, reveals that his character is eager to serve his country but does not fully understand the brutality and loss that come with it. The episode also delves into the relationship between Lord John Grey and Jamie, and introduces a new adversary for Ian after he accidentally kills Mrs. Bug.