"Frontier Marshal" is a classic Western film released in 1939, directed by Allan Dwan and starring Randolph Scott as Wyatt Earp. The film is loosely based on the life of the famous lawman and his involvement in the infamous shootout at the O.K. Corral in Tombstone, Arizona.

The film follows Earp as he arrives in the town of Tombstone to serve as the new marshal. He quickly finds himself in conflict with a gang of outlaws led by Ben Carter (played by Joe Sawyer), who are terrorizing the town and threatening the safety of its citizens.

As Earp investigates the gang's activities and attempts to bring them to justice, he is aided by his loyal deputy, Bat Masterson (played by Cesar Romero), and his romantic interest, Dallas (played by Nancy Kelly). Along the way, Earp is forced to make difficult choices about his methods of law enforcement and his own personal values.

The film culminates in a thrilling shootout at the O.K. Corral, where Earp and his allies face off against the Carter gang in a deadly confrontation. The outcome of the shootout is a turning point for Earp, as he realizes the high cost of violence and the need for a more peaceful approach to law enforcement.

"Frontier Marshal" is a classic Western film that explores themes of justice, violence, and the struggle for order in a lawless frontier town. Scott delivers a strong performance as the determined and principled Earp, and the film's exciting action sequences and rich character development have made it a favorite among Western fans for generations.