You can find a detailed breakdown of the plot and cultural impact on the Outlander Wiki.
Since your request is to "develop a paper" on this topic, I’ve structured a short academic-style analysis below. It focuses on the episode's narrative weight, the themes of honesty and trauma, and its significance within the series' broader context. Analysis of Outlander S03E08: "First Wife" Introduction
The physical and emotional scars of the characters are on full display, suggesting that while the "Sassenach" has returned, the damage of two decades cannot be erased with a single embrace. Conclusion
To watch the episode legally with high-quality subtitles and audio, it is available on Starz and Netflix (depending on your region).