First, in "Rhythm of the Rio Grande," singing cowpoke Tex Ritter is out to avenge his pal's murder. After travelling to Cinco Valley, he discovers that a Mexican thug harming settlers there may be the varmint who killed his buddy. With Suzan Dale, Warner Richmond. Then, in "Rainbow Over the Range," Ritter shines as a U.S. marshal looking for horse thieves who are robbing animals from the cavalry. During the course of the investigation, he meets a schoolteacher who may have a connection to the crimes. Slim Andrews, Dorothy Fay co-star. 100 min. total. Standard; Soundtrack: English. Plays All Regions.