Uncle Buck, an idle good-natured bachelor, is left in charge of his nephew and nieces during a family crisis. While his carefree ways easily charm the younger relatives, he meets more than a little hostility from Tia, his rebellious teenage niece, and Chanice, his impatient girlfriend.

Spoof of the western film genre in which good triumphs over evil. Rascally scoundrel Evil Roy Slade (Astin) struggles to become an honest man to win the love of a beautiful women.