Border Vigilantes (1941)

Cuando un amigo de Hoppy muere al intentar huir de la cárcel, le echan la culpa a él y le expulsan de los Texas Rangers.

Finishing a trail drive, Hoppy and the boys head to town and immediately get caught up in the conflict between school teacher Miss Abott and next door saloon owner Mawson. When Miss Abott disappears, Hoppy gets a clue to her location and rescues her from Mawson's cabin. It looks like Mawson is the man he wants, but Hoppy finds an item that indicates otherwise.

La diligencia en la que viaja Marie Stevens con su madre y su padrino de boda, es asaltada, y a Marie le roban las joyas que le diera su prometido Richard Adams. Hopalong Cassidy y su par de colaboradores les rescatan de los bandidos, pero ciertos hechos harán que se conviertan en sospechosos de estar aliados con quien cometieron este robo.

Dos 'rangers' de Texas acuden en ayuda de un colega ahora establecido en California. De esta manera matarán dos pájaros de un tiro, ya que persiguen a un forajido que huye hacia California. Allí se encontrarán con una banda de malhechores que roban grandes propiedades.

Julie's husband has been murdered and land agents want her to sign away her property rights. Hoppy warns against this but she does so anyway. It looks as though she will be unable to deliver the timber called for in her agreement. Hoppy has to make the lumber deal happened and solve the murder.

Hoppy's brother has been murdered and he is on the trail of the murderers. To get them he makes himself seem to be a wanted man.

Hoppy's ranch is threatened by rustlers. Hoppy and the gang oblige as usual.

Hoppy returns to find Johnny in trouble. Buck Peters has been shot by Porter who made it look like Johnny did it. When Johnny flees he runs into Linda. He takes a liking to her only to learn her father Shanghai is one of Porter's gang. Going after Shanghai, he gets captured by the gang and Porter now plans to kill him. But Hoppy is near by and Johnny will get unexpected help from Shanghai.

Hoppy's friend Dennis owns a rich gold mine. Frazier who owns the adjoining mine and wants the Dennis mine, has Dennis killed. Hoppy steps in to take over running the Dennis mine and learns Frazier's men sneak into and work the Dennis mine at night. Hoppy captures one of Frazier's men only to be captured in return by Frazier and left to die in a burning building.

Hoppy, Johnny and California go to Arabia to buy some horses. There they get involved with a sheik and a harem and a kidnapping plot.

A town bedeviled with outlaws sends for Hoppy, Lucky and California after their own vigilante committee fails to solve the towns problems. Hoppy discovers that the bad guys are led by the town boss, and so are the vigilantes.

Cuando deciden comprar la mitad de un rancho, Hopalong Cassidy (William Boyd) y sus compañeros, California y Johnny, se verán en líos cuando alguien quiere monopolizar el agua y además presiente que, en aquella tierra, hay petróleo de por medio.

Buck Peters arranges for Hoppy, California, Johnny and other cowboys to go to the aid of friends whose cattle are being rustled. Hoppy and California locate the rustlers' hideout and join the gang by posing as outlaws themselves, but must find a way to let the rest of the posse know where they are.

La llegada de la ingenua maestra June Lake al villorrio donde el caballeroso Hopalong Cassidy tiene su famoso rancho Bar 20, revoluciona la vida de los vaqueros. Pero también irrumpe por allí el cuatrero Sutton, quien con sus forajidos aterroriza a los pueblerinos y roba el ganado del rancho

Stephen Westcott and Ed Martin scheme to put Jane Travers' wagon line out of business. They want to use it take over all the wagon- train traffic going west. Hoppy, California and Lucky must make sure that doesn't happen.

Posing as a cattle buyer, Hoppy crosses over into Oklahoma where the Jordan brother's and their outlaw gang operate outside the law. After receiving an unfriendly reception when he finds them, he, California, and Johnny rustle their cattle and drive across the river into Texas. He hopes they will cross over to retrieve their cattle and then he can arrest them.

Tres guardianes de Texas, encabezados por Hopalong Cassidy, cabalgan a la vera de un río cuando descubren que un hombre mexicano acaba de ser abaleado. Una mujer les confunde entonces con los asesinos, y apuntándoles con un revólver, consigue llevarlos hasta la guarnición mexicana donde ellos rebelarán su verdadera identidad. Después, habrá alguien interesado en Silver Bullet en convencer a todo el mundo de que realmente son ellos los asesinos.

Joe Weller has instigated a conflict over water rights between two ranchers. The idea is to have the ranchers do each other in then move in and take over. Hoppy and the good guys won't let this happen.

Hopalong Cassidy and Johnny Nelson ride to the mountains to help a man and his daughter save their logging business from someone who is sabotaging their efforts.

Hoppy, California and Johnny come to the ranch of a friend and his daughter, disguised as dude detectives from the east, to investigate the disappearances, without a trace, of several herds of cattle.