The boys decide to host a science fiction convention and Dolly approves it, hoping it will fail so that all future decisions are hers. However a genuine alien, Evil Destructor from the planet Splurge, turns up and steals the hotel's soap to fuel its return journey. Having been abducted by the alien some years previously, Mrs. Poshington knows how to send it packing but Dolly thinks the whole incident is down to clever special effects and gives it her approval.