Ranch owner Billy Porter leaves the wilderness to seek his fortune in San Francisco with his engine invention. Once in the city, Billy is fleeced of his money, and then befriends a sympathetic little lame boy, Jim McClusky, and his father, prizefighter Knockout McClusky, who is in jail for a crime for which he is innocent. Billy cares for the four waifs of the family until their father is released. Billy also meets Pearl Matthews when he stops her runaway horses in a park. Just prior to the start of a big fight in which Billy has backed McClusky against Tiger Doran, Billy discovers that McClusky has been drugged. With the aid of John B. Prescott, Billy enters the ring and knocks out Doran. Prescott turns out to be Billy's own father who is president of a big motor corporation and whose letter was responsible for Billy originally going to San Francisco. Billy perfects his motor and enters his car in a race. Despite an attempt to wreck his car, Billy wins the race, as well as Pearl's love.

Director:
Edward J. LeSainte	Director
Cast:
Tom Mix	as Billy Porter
Eva Novak	as Pearl Matthews
Charles K. French	as John B. Prescott
Hayward Mack	as Philip Malcolm
L. C. Shumway	as Knockout McClusky
Helen Wright	as Mary
Jack Curtis	as Red Meegan
Georgie Stone	as Jim McClusky
George H. Hackathorn	as Tom Matthews
Charles Hill Mailes	as John Matthews
Ernest Shields	as Cigarette Keefe
Cinematography:
Fred Granville	Camera
Writer:
Denison Clift	Scen
H. H. Van Loan	Story

The working title for the film was High Speed. Some scenes were shot at the Soldier's Home in Santa Monica, CA and at Elysian Park in Los Angeles. According to news items, Civil War veterans from the Soldiers Home were used as extras in the production.