"Frontier-S3E6.mp4" refers to the third season finale of the series, "The Sins of the Father," which originally aired on November 23, 2018, and centers on Declan Harp's final confrontation with Lord Benton. The episode concludes major storylines, including Harp killing Benton and discovering his son is alive, while Sokanon achieves vengeance against O'Reilly. For more details, visit Rotten Tomatoes . Netflix's Frontier - Season 3 Review - The Game of Nerds