The series centers around the quirky and diverse Smith family and their three housemates. The family includes Stan Smith, the father, husband, and primary earner; Francine Smith, his devoted wife; their college-aged daughter, Hayley Smith; and their high school-aged son, Steve Smith. Beyond the immediate family, the show features three other main characters: Hayley’s boyfriend-turned-husband, Jeff Fischer; Klaus, the family’s pet who is a man trapped in a goldfish’s body; and most notably, Roger, the eccentric alien known for his disguises, audacity, and outrageous behavior.