They therefore decide to destroy the planet, but just before they can, Dennis asks that the source of the power be destroyed, causing a laser beam shooting towards Earth to bounce back to the alien's ship, killing them all and destroying the galactic power.
They therefore decide to destroy the planet. The source of the power be destroyed, causing a laser beam shooting towards Earth to bounce back to the alien's ship, killing them all and destroying the galactic power. This is what Dennis asks. They can.