A sea monster kills three villagers in a Norwegian fjord; however, one man survives. Seaview arrives to investigate. Nelson and Crane are met with hostility from the locals and find the survivor has died. Nelson does his best to make sure the "sea monster" doesn't destroy Seaview.
| Name | Type | Role | |
|---|---|---|---|
| Berne Giler | Writer | ||
| Kort Falkenberg | Guest Star | ||
| Anna Lisa | Guest Star | ||
| Richard Carlson | Guest Star | ||
| Steven Geray | Guest Star | ||
| Frank Richards | Guest Star | ||
| Torben Meyer | Guest Star | ||
| Stanley Jones | Guest Star | ||
| Erik Holland | Guest Star | ||
| Greger Vigen | Guest Star | ||
| Irwin Allen | Director |