A murder at an observatory alerts Sloane to a plot to divert a huge comet toward North America.
| Name | Type | Role | |
|---|---|---|---|
| Stephen Kandel | Writer | ||
| Michael Alldredge | Guest Star | ||
| Lawrence Bame | Guest Star | ||
| Martina Deighnan | Guest Star | ||
| Eldon Quick | Guest Star | ||
| Roberta Lee Carroll | Guest Star | ||
| Ben Wright | Guest Star | ||
| Eric Braeden | Guest Star | ||
| Glenn Sipes | Guest Star | ||
| Nancy DeCarl | Guest Star | ||
| Richard Lockmiller | Guest Star | ||
| Pat Klous | Guest Star | ||
| Elizabeth Lindberg Gallagher | Director | ||
| Ray Austin | Director |