In “Mr. Spaceship”, human beings in the distant future are at war with alien life forms known as “Yuks”. Using out-of-date, mechanical machines to wage battle against the life-based weapons from the advanced Yuks, a study team decides to build a spaceship driven by a mind. Enlisting a dying teacher who agrees to contribute his brain towards the task, the human beings believe they have turned the furniture on the Yuks. But the spaceship has other plans.