Barney and Fred get a Hopparoo (a Stone Age kangaroo) for Bamm-Bamm as a pet. After causing momentary chaos for Fred, Hoppy is accepted and invited along on a picnic with the group, where he and Dino end up saving the families from near catastrophe.
| Name | Type | Role | |
|---|---|---|---|
| Warren Foster | Writer | ||
| Alan Reed | Guest Star | ||
| Mel Blanc | Guest Star | ||
| Don Messick | Guest Star | ||
| William Hanna | Director | ||
| Joseph Barbera | Director |