A friend of Dr. Hyatt's, Judge Ralph G. Addison, has been receiving anonymous calls and letters warning that he will die if a man he sent to death row is executed. Checkmate's investigation raises questions about the condemned man's guilt, and the judge's character.
| Name | Type | Role | |
|---|---|---|---|
| Robert Libott | Writer | ||
| Helen Nielsen | Writer | ||
| Robert H. Harris | Guest Star | ||
| Larry Kert | Guest Star | ||
| David García-Intriago | Guest Star | ||
| Norma Crane | Guest Star | ||
| Sidney Clute | Guest Star | ||
| Virginia Gregg | Guest Star | ||
| Barney Phillips | Guest Star | ||
| Frank Sully | Guest Star | ||
| Cy Malis | Guest Star | ||
| James Gregory | Guest Star | ||
| John English | Director |