A secret submarine, the murder of a Navy officer and strange amnesia create a puzzling case for Steve McGarrett.
| Name | Type | Role | |
|---|---|---|---|
| Robert Janes | Writer | ||
| Geoffrey Lewis | Guest Star | ||
| Jeff Kennedy | Guest Star | ||
| Dale Robinette | Guest Star | ||
| Don Rockwell | Guest Star | ||
| Don Pomes | Guest Star | ||
| Tom Pierson | Guest Star | ||
| Jorie Remus | Guest Star | ||
| Vernon Hayes | Guest Star | ||
| Herb Hardin | Guest Star | ||
| Jo Anne Morgan | Guest Star | ||
| Joseph Winzenreid | Guest Star | ||
| Kenneth Ploeger | Guest Star | ||
| Landon Bloomer | Guest Star | ||
| Jim Doney | Guest Star | ||
| Bob Basso | Guest Star | ||
| Maud Adams | Guest Star | ||
| Joe Moore | Guest Star | ||
| Steven H. Stern | Director |