 Another Martian spacecraft crash lands on Earth. It happens to be Martin s 11-year old nephew, Andromeda, who has come to Earth since he got lost in a cosmic storm. Andromeda is a proud Martian, who can t understand why Martin has taken on so many Earthly attributes, including the name Martin (his real name is Exigius 12-1/2). Andromeda refuses to wear Earth clothes or take on the name "Andy". He even tells the truth to Mrs. Brown and Det. Brennan, who think he just has an active child s imagination. But the detective is wary about the O Hara s ability to raise a child, and threaten to call in the authorities unless he gets a proper education. This means that Andy has to go to school. But Andy again refuses to hide his Martian background and demonstrates his Martian abilities to his teacher and classmates, who are all afraid for their lives by this obvious alien. Andy is hurt by their attitude, but Martin tried to warn him. The military and police force are called out to locate Martin and Andy and Tim, all considered alien and hostile. The only person who still sees them as friendly is Mrs. Brown. But she cannot change the minds of the rest of the world. Luckily, Martin can use his CCTBS - his time machine - to take the three of them back in time to just before Andy heads off to school and when the trouble began. Andy has learned his lesson. In the meantime, Tim has another Martian house-guest and a new "cousin".