Franz Josef and Edek Baryła, two Polish teenagers, were worried that a shortage of cash will force them to spend the summer holidays at home. But they never expected to come face-to-face with an alien from another dimension, who explains that his planet is in danger of destruction (and what's worse, his planet and Earth are cosmically connected, and if his home world is destroyed, the Earth will blow up too). He asks them to assemble a device that can save it.