Anna impulsively jets off to Tuscany, Italy, to stay at a stranger's villa without permission. Caught inside the house by the man's mother, she convinces the woman that she's his fiancée. That little lie soon becomes a big problem when Anna develops a growing attraction to the stranger's handsome cousin.
Having thwarted Bowser's previous plot to marry Princess Peach, Mario and Luigi now face a fresh threat in Bowser Jr., who is determined to liberate his father from captivity and restore the family legacy. Alongside companions new and old, the brothers travel across the stars to stop the young heir's crusade.
