After a doctor is charge with spying it is learned that a synthetic crystal can record sounds.
| Name | Type | Role | |
|---|---|---|---|
| Norman Jolley | Writer | ||
| Marshall Thompson | Guest Star | ||
| Marilyn Erskine | Guest Star | ||
| Michael Fox | Guest Star | ||
| Ray Collins | Guest Star | ||
| Elizabeth Patterson | Guest Star | ||
| Norman Jolley | Director | ||
| Ivan Tors | Director | ||
| Leigh Jason | Director |