Francine is eager to re-live the Smith kids' childhood theme park adventures on a family visit to "Familyland." But, when the nefarious and cryogenically-frozen founder of the theme park, Roy Family, is mistakenly thawed, the Smiths find themselves prisoners of the medieval-themed park.

Roger and Steve switch faces in a scheme that has the former wooing an attractive girl for the latter, but things come to a head when Roger actually falls for the young lady. Meanwhile, Stan and Francine take to the sky as "Charlie's Angels"-type flight attendants to thwart a sinister scheme concocted by Mark Cuban.