Alan Dean Foster 
Flinx Transcendent 

Flinx is the only one with any chance of stopping the evil colossus barrelling in to destroy the Humanx Commonwealth (and everything else in the Milky Way.) His efforts take him to the land of his mortal enemies, the bloodthirsty AAnn, where chances are excellent that Flinx may be executed. And he must also seek out an ancient sentient weapons platform wandering around the galaxy and then communicate with it, a powwow that could very well fry his brain. Then there are the oblivion craving assassins determined to stop Flinx before he can prevent total annihilation. With a future that rosy, it’s no surprise that Flinx is flirting with disaster. Still, he’s no quitter. Now he’s going to need every once of his know-how, because he’s venturing to places where no one’s every been, to do what no one’s ever done, and where his deadliest enemy is so close it’s invisible.