King of the Texas Rangers (1941)

When Captain King of the Texas Rangers is murdered by saboteurs, his son, Tom ("Slingin' Sammy Baugh"), a famous football star, leaves college and joins the Texas Rangers himself. Shortly after, Tom is given the mission of avenging his father's death and defeating the foreign agents. John Barton (Neil Hamilton), supposedly a respectable citizen, works with "His Excellency" (Rudolph Anders), a mysterious leader of a gang of saboteurs, intent on destroying the Dobe Hills Oil Company oil fields in Texas. Tom teams up with Sally Crane (Pauline Moore), a reporter who witnessed his father's murder, and Mexican officer Lt. Pedro Garcia (Duncan Renaldo). The agents are working across the border in both countries with destroying the saboteurs' hideouts being their goal. One of the targets of the gang of saboteurs is an invention by Professor Nelson (Joseph Forte) who has developed a new type of aviation fuel. Tom protects the professor, riding aboard a train as his bodyguard. foiling the plot to kidnap the inventor. When rumors spread that the new aviation fuel is dangerous, Tom and Sally set out in an aircraft to prove the fuel is safe. When Pedro learns that Tom's aircraft is rigged with a time bomb, he warns him in time for Sally and Tom to parachute to safety. The saboteurs plan to destroy the Whitney Dam would flood the oil fields in Texas, and when Sally finds one of their hideouts, Tom has to rescue her. Barton and his gang finally get their hands on the formula for the special aviation fuel and set out in a dirigible flown by "His Excellency". Their attack on the oil fields is thwarted when Tom and Pedro crash their aircraft into the dirigible, killing the gang. The two lawmen parachute to safety and are later honored by the Texas Rangers for their bravery.