Personnel Officer Drew Heriot returns to England after working in Australia to discover his brother behaving oddly, to the distress of his sister-in-law Anne. Investigating together they discover that a disembodied alien force is using high frequency signals to brainwash people - including Drew's brother - into committing subversive acts, as a prelude to a full-scale invasion. Together, Drew and Anne battle to stop the acts of sabotage while trying to alert the authorities to the danger
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | May 1965 | July 1965 | 11 |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Unassigned Episodes | 11 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 11 |
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