Two Martians conduct an investigation at the scene of a murder to try to determine why humans kill one another.
| Name | Type | Role | |
|---|---|---|---|
| Leslie Stevens | Writer | ||
| Robert Fortier | Guest Star | ||
| Robert Kelljan | Guest Star | ||
| Linda Hutchins | Guest Star | ||
| Carroll O'Connor | Guest Star | ||
| Barry Morse | Guest Star | ||
| Grace Lee Whitney | Guest Star | ||
| Leslie Stevens | Director |