Long before he became producer/director of The Tonight Show, Fred DeCordova helmed the Universal meller Illegal Entry. Howard Duff, who later worked with DeCordova on the TV series Mr. Adams and Eve, stars as Bert Powers, an undercover agent for the U.S. Department of Immigration. While attempting to bring a vicious gang of alien smugglers to justice, Powers falls in love with Anna Duvak (Marta Toren), a gang member who is Not What She Seems.
A cavalry deserter poses as a major and leads a wagon train with a hidden cargo of repeating rifles.
In 1948 rural America, two stepbrothers compete for the same gal and the younger brother buys two untamed mules for work projects while the older brother tries to sabotage him.