Siblings Klatu, Lek, and Ploo from the planet Loogl return to Las Vegas where they discover an impending invasion of earth by evil aliens disguised as Elvis impersonators.

"In the sixteenth -- and perhaps the most crucial -- story in this exhilarating series, Sammy Keyes is about to uncover the most personal mystery of her life: who is her father? In the wild ride to and around Las Vegas, she tracks down her Diva mom -- who might be there to marry Sammy's boyfriend's father! With the help of a few Elvis impersonators, Sammy finally gets some answers in an adventure that will have listeners "all shook up"!"--