After a violent thunderstorm scares a house party, the guests flee to a nearby home for shelter.. only to discover, a more sinister hand is at play.. Now, they can't escape the strangers home due to the thunderstorm, but they can't stay inside due to the danger that follows them.

The mega lightning storm brings out the worst in people, and the latest storm finds a whole new set of victims during a home invasion gone wrong.

The mega lightning is back yet again in this third instalment. A new group must survive the mega lightning. Can the UK survive another storm?