Dan Farrell (RS) runs into many dead ends as he endeavors to discover why an important scientist suddenly died.
| Name | Type | Role | |
|---|---|---|---|
| Forrest Tucker | Guest Star | ||
| Susan Oliver | Guest Star | ||
| Tom Bosley | Guest Star | ||
| Leif Erickson | Guest Star | ||
| Douglas Fowley | Guest Star | ||
| John Vernon | Guest Star | ||
| John McGiver | Guest Star | ||
| Robert Day | Director |