When a girl is found murdered and numbered 'one', McGarrett suspects a serial killer. However the killer seems to be very selective in targeting members of a particular company, and suspicion soon falls on two brothers who stand to inherit the firm from their aged aunt.
| Name | Type | Role | |
|---|---|---|---|
| Palmer Thompson | Writer | ||
| Farley Granger | Guest Star | ||
| Minda Gold | Guest Star | ||
| Paul Collins | Guest Star | ||
| Elithe Aguiar | Guest Star | ||
| Bob Basso | Guest Star | ||
| Corrine Opsahl | Guest Star | ||
| Jeanette Nolan | Guest Star | ||
| Michael Leong | Guest Star | ||
| John Stalker | Guest Star | ||
| Paul Stanley | Director | ||
| Robert Stambler | Director |