Richard and Sharron accompany a visiting President and his wife on a submarine journey, but an assassination attempt means that they will require all of their powers to save the President.
| Name | Type | Role | |
|---|---|---|---|
| Donald James | Writer | ||
| John Stone | Guest Star | ||
| Mike Pratt | Guest Star | ||
| Viola Keats | Guest Star | ||
| Peter Howell | Guest Star | ||
| Henry Gilbert | Guest Star | ||
| Laurie Asprey | Guest Star | ||
| John Turner | Guest Star | ||
| Rio Fanning | Guest Star | ||
| Paul Dickson | Director |