(The sixth book in the Blobheads series)
A Chapter Book by Chris Riddell and Paul Stewart
The day Billy found aliens in his bathroom started badly. Then the aliens decided to move in - and things got worse. The Blobs, Kerek, Zerek and Derek, are on a mission - to protect the High Emperor of the Universe, who happens to be Billy's baby brother.
Used availability for Chris Riddell's Silly Billy
June 2000 : UK Paperback