Edited version of the 1940 Universal serial "Flash Gordon Conquers the Universe", released in a syndication package to TV in 1966.

A Texas Ranger (Roy Rogers) and his pals come out of forced retirement to do what the cavalry cannot.

The scout's grandson foils land-grabbers; his sidekick flirts with twins.

"Nevada" and "Weary" Pierce hijack the loot taken in a bank hold-up by Les Setter, and his gang. They escape from Sheriff Jim Henry Warner. U. S. government horse-buyer David Ward is killed by Settler's men and Settler takes his papers and goes to the ranch of Blaine and asks for the horses Ward was to buy, promising payment from the government later. He also takes an interest in Ina Blaine, much to the resentment of her sweetheart Ben Ide. "Nevada" and "Weary" are hired for the horse round-up but Setter has them and Ben arrested on a fake charge.

Two marine lieutenants battle a masked would-be world conqueror who uses electricity as a weapon.

In 1865, Captain Mark Smith of the Confederate Army leads a band of deserters to conquer Texas and rule it as a dictator. In one of his first actions, he captures and assumes the identity of Texas' new Finance Commissioner, Colonel Marcus Jeffries, after having the real man murdered. When a contingent of Texas Rangers enters the territory, Snead, one of Smith's men, leads them into an ambush by Smith's "troopers". The Rangers are apparently wiped out, although one injured survivor is left. The survivor, nursed back to health by Tonto, swears to avenge the massacre and defeat "Colonel Jeffries" and his men.

It's WW II and German Reuther has organized local gangs to sabotage the beef supply at the source. Marshal Lee Clark arrives to investigate and joins up with local cowboys Art Davis and Bill Boyd. Lee has a typewritten note from the gang and hopes it can be traced to it's source.

Kent wants the Allen ranch. So he has Steve and his men rustle their cattle using Pete as an informant. When the Trigger Pals Lucky, Stormy, and Fuzzy fight back, Kent frames Stormy for the rustling.

A mysterious plague, the Purple Death, ravages the earth. Dr. Zarkov, investigating in his spaceship, finds a ship from planet Mongo seeding the atmosphere with dust. Sure enough, Ming the Merciless is up to his old tricks. So it's back to Mongo for Flash, Dale, and Zarkov.

A ring of cattle thieves uses short-wave radio to communicate with each other. A trio of range detectives must find a way to capture the gang.