Hey, that's pretty good. It's a tad bit long though, there's really no need to actually summarize the book... I really like the first couple lines though (the "My house!" and "My planet!").

You didn't ask for suggestions, but here are some anyway. I'd shorten the direction part in the middle, maybe to something like this (also, I made certain words in caps, it makes them funnier, though I'm not sure why):

> (He and his friends travel through SPACE. They find out Earth was really just a COMPUTER ordered by MICE. On their way out of the planet, the four are nearly KILLED by space police.)

Maybe Sam or somebody else (ever since his cruel mockery of Illuminatus!, I'm not referring to the other one by name) can give you some other comments (assuming you want them)...