First, "The Three Mesquiteers" follows Robert Livingston and Ray Corrigan as they travel westwards for a new life after they get released from an Army hospital. But when they encounter an outlaw gang, they team with cattleman/motorcycle-riding hero Syd Saylor (portraying Lullaby Joslin) to stop them. With Kay Hughes. Then, in "The Trigger Trio," Corrigan, Max Terhune and Ralph Byrd go after a rustler whose scheme is infecting cattle with hoof-and-mouth disease. Sandra Corday, Robert Warwick co-star. Standard; Soundtrack: English. Plays All Regions.