Seth Isaac Johnson

Seth Isaac Johnson (born July 10, 2000) is a Canadian actor, recently known as Finn in R.L._Stine's 2025 YA Horror, "Pumpkinhead" and Max, in Megan Park's 2024 comedy-drama film My Old Ass, as well as the recurring role of Eugene in Season 2 of the hit series Firefly Lane. Early in his career, Johnson was notable for his recurring dramatic role as Denny Larsen in AMC's The Killing. Also as Danny in Nickelodeon's original TV movie Splitting Adam.

Life and career

Seth landed his first major role in AMC's dark crime drama The Killing. Appearing in over 20 episodes, Seth delivered a raw performance as the younger brother of a murdered girl. Award-winning director Patty Jenkins wrote of Seth, "He is truly exceptional and gifted beyond his years...He was a joy to work with in all regards and it was this and his talent that helped create the masterful series "The Killing” became.

Seth was nominated for a Best Guest Star Performance for his role of Shawn Raider in the TV Series Supernatural, at the 2018 Leo Awards. He completed a degree in Behavioral Neuroscience while filming recurring role in Netflix series Firefly Lane before spending his first summer out of school filming Writer/Director Megan Parks Sundance hit, My Old Ass, in Muskoka.

Seth is the son of actor Tanis Dolman and musician Jason O. Johnson.

Johnson was 2015 Joey Award Winner Best Actor in a Feature for his portrayal of Beckett in Into the Grizzly Maze.

Johnson was nominated for “Best Guest Performance” for his portrayal of Shawn Raider in the Supernatural episode “Advanced Thanatology” in the 2018 Leo Awards.