Hardy assigns Drake to investigate when the entire research team working in tropical diseases is killed by mysterious accidents. Drake travels to India, and uncovers clues that one of the scientists may be alive.
| Name | Type | Role | |
|---|---|---|---|
| Ralph Smart | Writer | ||
| Brian Clemens | Writer | ||
| Richard Pearson | Guest Star | ||
| William Peacock | Guest Star | ||
| Michael Ripper | Guest Star | ||
| Zia Moyheddin | Guest Star | ||
| Maria Landi | Guest Star | ||
| Bryan Coleman | Guest Star | ||
| Julia Arnall | Guest Star | ||
| Joanna Dunham | Guest Star | ||
| Charles Frend | Director |