Thundering Through

On the American frontier in the last decades of the 19th century, Billie is a female cowboy who fights a series of bad men in this film serial.

A lost film. As described in a film magazine Exhibitors Herald on March 16, 1918: "a forest ranger known only as Headin' South (Fairbanks) goes forth in search of Spanish Joe (Campeau), a Mexican responsible for most of the treachery and outlawry along the U.S.-Mexican boarder. Headin' South gains quite a reputation as he goes along and finally believes himself worthy of joining Joe's band. in a whirlwind finish in which Joe is captured, Headin' South meets one of Joe's near victims (MacDonald) and falls in love with her."

Just before the Civil War (but after the South has seceded), Southern saboteurs try to prevent railroad construction from crossing Kansas to the frontier; army captain Nelson is sent out to oppose them. As the tracks push westward, Nelson must contend with increasingly violent sabotage, while trying to romance the foreman's pretty daughter Barbara.

Madge Black witnesses her best friend Nan Westland, kissing her husband, successful lawyer Jeffrey Arnold Black, a successful lawyer, and orders Nan from the house. Angered by her refusal to let him explain, Jeffrey leaves his wife and son David, Jeffrey meets Nan on a westbound train. Though he does not love her he offers his protection and the next year they welcome a son, William. Nan pleads with him to divorce Madge and marry her for the sake of their son, but he will refuse. Distraught, she marries Ben Richardson, a client of Jeffrey's client, leaving their son behind. Twenty years pass with David becoming a responsible adult while half-brother William now known as “Rodeo” becomes the leader of a lawless band of robbers. Meanwhile Ben Richardson and Nan have become owners of Chanceland, a gambling-house in Colorado and it is there that things reach a climax between the near identical brothers.

A college graduate returns West after ten years in the East to her home in Sulfur Springs. Virginia's mother, the owner of a rooming house has turned hard and uncaring in her absence and the girl finds comfort in her friendship with Ross Cavanagh, a forest ranger. The latter runs afoul of cattle baron Sam Gregg, who resents a new tax on cattle grazing on government land.

A lost film. Teddy Drake is a pleasure-seeking aristocrat who ends up expelled from his exclusive Fifth Avenue club for playing practical jokes and other rambunctious antics. He decides to reform his selfish ways and boards a train heading heading for the Southwest.

A western settlement of pioneer descendants is threatened with the loss of its water supply through the encroachments of nearby townspeople.

Homesteaders battle a cattle baron, who is trying to drive them off the lands they have settled on so his cattle will be able to graze on it.

In an early California settlement, Juanita, a dance hall queen of Castilian ancestry, knifes her lover, Jim Brandt, the dance hall owner, when she catches him embracing a new dancer.

About to marry Jim Plummer, Kate Foley runs off to Nevada when Ed Bagley convinces her a quick fortune can be made robbing gold shipments that are being transported by the railroad. In Bannock City she meets reformed-bandit Frank Plummer, posing as Frank Norris, brother of Jim Plummer, who has being going straight and working as an express shipment guard. Jim also shows up and plans a robbery by stealing a train and hiding it in an abandoned tunnel. The two brothers are on opposite sides of the law with the now-reformed Kate caught in the middle.

Jeanne La Roche lives alone with her brother in the great northwestern country. Jacques is a ne'er-do-well and has fallen under the suspicion of the mounted police, two of whom are dispatched to arrest him for robbery. The stolen goods are found in his home. Jeanne is too young to be left in their lonely cabin, so she is taken to the post, where the wife of the proprietor welcomes her and gives her a home. Several years later, Donald McLean wins her for his wife. Meantime Jacques escapes from prison, eludes his pursuers and takes refuge in McLean's home.

Left in the care of his half-breed brother, Buck, by his dying mother, Wallace Layson has no knowledge of his family history. His father, knowing that his son will inherit a ranch on his 21st birthday, tries to secure the property for himself by persuading a dance hall girl to come between the boy and his fiancée. When Buck learns of the plan he decides to foil it without his half-brother knowing.

A Mexican bandit is about to be executed in the United States, so his brother takes over a train and holds the passengers as hostages unless his brother is released. Now both the Americans and Mexicans are baffled as to what to do. One of the passengers — who wrote the letter for their captor — has a suggestion: call mercenaries Hank Brackett and Johnny Reech. They do, and as expected they do come up with a plan, but the president of the railroad is not sure if it will work.

Gold miner Edd Denmeade loves Lucy Watson, the sister of the official mining claim recorder. Denmeade suspects Watson of killing his father, who after a poker game was shot by a gambler "who shuffles with one hand." The real murderer, Sam Spralls, has convinced Watson that he killed Denmeade and threatens to expose him unless Watson assigns him all the gold claims. Spralls assembles a band of killers to jump the claims when Watson complies. Eventually, Denmeade learns the identity of the killer when he sees Spralls shuffle a deck of cards. He forms a vigilante party and rids the community of Spralls and his gang.

Trying to trick Ma (Lydia Knott) and Mary Winters (Allene Ray) into selling their rundown ranch, which will be in the path of a future railroad, Underwood (Charles K.French) hires Keno Creager (Albert Smith) to impersonate Jimmy Winters, not seen by his mother and sister for many years.

Not realizing he is a bandit The Girl, owner of the Polka Saloon, falls in love with Ramerrez. Trapped by a snowstorm Ramerrez is forced to stay the night with The Girl. Upon discovering the situation jealousy drives dancer Nina Micheltorena to reveal his identity and whereabouts to Sheriff Jack Rance, who also loves The Girl. Ramerrez is shot trying to escape, and though she denies his presence she shelters him. Drops of blood prove lead to his discovery. Taking a chance The Girl wins both their freedom in a poker game with the sheriff. However incited by Nina, vigilantes are about to lynch Ramerrez when the sheriff interferes, explains his bargain, and restores him to The Girl.

A town—where everyone seems to be named Johnson—stands in the way of the railroad. In order to grab their land, robber baron Hedley Lamarr sends his henchmen to make life in the town unbearable. After the sheriff is killed, the town demands a new sheriff from the Governor, so Hedley convinces him to send the town the first black sheriff in the west.

After the train station clerk is assaulted and left bound and gagged, then the departing train and its passengers robbed, a posse goes in hot pursuit of the fleeing bandits.

In the Old West Charles Garvin and Clarice Winslow are happily engaged. One day artist, Ed Gardner arrives seeking lodging and is welcomed into Clarice's home, where he meets the young cowboy. However, when Charles must depart for a round-up, Ed begins to charm Clarice, who seems amused by his company and a triangle develops.

A US Army officer is sent undercover into the hills of Mexico's Baja California region to find and bring down the madman Crando and his group of crazed followers, who are setting up their own criminal empire spreading from Mexico into the United States.