Ryan Richmond is an eccentric teenager living with his mother, father, sister and brother in the Holiday Inn they own in Sunnyvale, Arizona, the prune capital of the world. Is it any wonder that he wants to go to Saudi Arabaia for college and leave Sunnyvale far, far behind? He spends his days at school with his sex-obsessed best friend Dan Forrester and lusts after Lisa Winston, the sexy lounge singer who his parents have hired to perform at the Holiday Inn. Stuck without a date for his brother's wedding to a senator's daughter, Ryan goes to a computer dating service, which asks him such questions as "Can you breathe foreign substances?" Soon, Ryan is told that he may be an alien stuck on Earth along with thousands of others. Soon, Charles and Edna Pinsky show up and tell him that he may an alien prince meant to lead his brethren home. And that's when things get out of control...

Consultando il computer per fissare la data ideale per il matrimonio della sorella, Ryan entra per caso in un sito e scopre che le proprie coordinate anagrafiche e caratteriali corrispondono perfettamente a quelle di un extraterrestre. Ryan, la cui indole ribelle costituisce motivo di preoccupazione per i genitori, crea ulteriore imbarazzo in famiglia e finisce con l'essere coinvolto nella predicazione di un gruppo di ufologi che da tempo aspettano l'arrivo di un messia alieno, convinti che li guiderà verso alti traguardi di progresso e di civiltà.