A farmer's herd sickens and dies, then his family and neighbors fall ill, so he bucks the state agricultural establishment as he pursues the politically-explosive investigation of how his farm, family, and friends came to be poisoned.
| Actor | Role |
|---|---|
 Ron HowardNed De Vries | Ned De Vries |
 Art CarneyWalter Peary | Walter Peary |
 Tarah NutterKate De Vries | Kate De Vries |
 David KnellBrandon | Brandon |
 Barry CorbinDr. Agajanian | Dr. Agajanian |
 Richard DysartDr. Morton Freeman | Dr. Morton Freeman |
| MMichael BondDr. Bill DeJong | Dr. Bill DeJong |
 Jim HaynieDoc Vandecamp | Doc Vandecamp |
| RRobert HirschfeldHarold | Harold |
 G.W. BaileyJim Laszlo | Jim Laszlo |
 Robert BehlingArt | Art |
| KKen HixonWilliams | Williams |
 Dwight SchultzSchlatter | Schlatter |
 Joe MiksakAl | Al |
 Charlotte StewartMrs. Laszlo | Mrs. Laszlo |
| WWill MarchettiFarmer #3 | Farmer #3 |
| RRoss McKerrasMan #1 | Man #1 |
 Terry David MulliganMan #2 | Man #2 |
| FFrank PapiaPlant Manager | Plant Manager |
| JJohn ArgueChairman | Chairman |
 Al CingolaniHarley | Harley |
| LLinda StuartSecretary | Secretary |
| MMatthew LocricchioWorker | Worker |
 Christopher KriesaMarshall | Marshall |
 J.E. FreemanFarmer #2 | Farmer #2 |
| BBill ReddickNot listed | Not listed |