Donnie goes missing and the rest of the Thornberry family have various adventures (broken bones, getting lost in a cave, and a forest fire) while looking for him. It has been screened as a TV movie and as four episodes in season 4 of the TV series.
| Directing | Dean Criswell | Director |
| Directing | Carol Millican | Director |
| Directing | Ron Noble | Director |
| Directing | Joseph Scott | Director |
| Writing | Sheila M. Anthony | Writer |
| Writing | Joan Considine Johnson | Writer |
| Production | Kate Boutilier | Producer |
| Production | Maureen Iser | Producer |
| Production | Arlene Klasky | Executive Producer |
| Production | Gábor Csupó | Executive Producer |
| Editing | Peter Tomaszewicz | Editor |
| Sound | Gregory Hinde | Music |
| Sound | Drew Neumann | Music |
| Production | Barbara Wright | Casting |
| Art | Rudi Berden | Storyboard Artist |
| Art | Karen Ciraulo | Storyboard Artist |
| Art | Robert Goodin | Storyboard Artist |
| Art | Tron Mai | Storyboard Artist |
| Art | Max Martinez | Storyboard Artist |
| Art | Gabi Payn | Storyboard Artist |
| Art | Pablo Solís | Storyboard Artist |
| Art | Monika Tomova | Storyboard Artist |
| Art | Al Zegler | Storyboard Artist |