A sixties psychedelic counterculture clash occurs during the "Summer of Love" when an aspiring hippie from New York dupes the son of a Swedish dairy farmer into smuggling illegal margarine into butter-rich Wisconsin
| Actor | Role |
|---|---|
 Doris RobertsGrandma Betty Johansson | Grandma Betty Johansson |
 Robert LoggiaGrandpa Griswold | Grandpa Griswold |
 Dee WallaceMadge Havershank | Madge Havershank |
 Ellen MuthKatie Trumbull | Katie Trumbull |
| MMichael SpellmanMelvin Johansson | Melvin Johansson |
 Ron G.Howard Schmear | Howard Schmear |
 Terry MooreMiriam Cuningham | Miriam Cuningham |
 Grant CramerBill Muskogee | Bill Muskogee |
 John WilkieDeputy Smith | Deputy Smith |
 Rocky RectorSheriff Ed Cosgrove | Sheriff Ed Cosgrove |
| MMatt PhillibenTom | Tom |
 Stephen BlackwellFarmer | Farmer |