Thunderhead, Son of Flicka is a 1945 American Western film directed by Louis King and starring Roddy McDowall, Preston Foster, and Rita Johnson. It is a sequel to the 1943 film My Friend Flicka. The film was adapted to screen by Dwight Cummins and Dorothy Yost from Mary O'Hara's novel, Thunderhead (1943), the second in a trilogy with My Friend Flicka (1941) and Green Grass of Wyoming (1946).