Martin's parents have disappeared. Also, it turns out, they are aliens. Which makes Martin ...?
Then Martin and Tina discover enormous light-emitting eggs in an abandoned mine. It is clear they are not going to be hatching out anything cuddly. And so the kids try to blow them up. But instead of blowing up, huge killer insects hatch, and go on a mission to destroy all human life on earth. Oops.
Having first rescued Martin's parents, the kids steal a cop car and then an ambulance. Eventually they fly, using Martin's power of telekinesis - someone really has been tinkering with reality - in thrilling pursuit of the killer insects.
Martin and Tina's friend Enda has assembled an extraordinary zapper that the children use to take down the evil insects, one by one by one out of the sky.
And that is how these amazing kids actually, literally save the world.
