UFO sightings and alien visitors tend to be solely the reserve of sci-fi movies.
So when a former MoD chief warns that the country could be attacked by extraterrestrials at any time, you may be forgiven for feeling a little alarmed.
During his time as head of the Ministry of Defence UFO project, Nick Pope was persuaded into believing that other lifeforms may visit Earth and, more specifically, Britain.
His concern is that “highly credible” sightings are simply dismissed.
And he complains that the project he once ran is now “virtually closed” down, leaving the country “wide open” to aliens.
Mr Pope decided to speak out about his worries after resigning from his post at the Directorate of Defence Security at the MoD this week.
“The consequences of getting this one wrong could be huge,” he said.