Well, first of all, he got attacked by Tigerstar as a kit (boo, Tigerstar, the evilest cat I've ever met!! especially after trying to take over the forest!!) who, then was first called Tigerpaw and Scourge was called Tiny. At the end of the book, he kills Tigerstar in one swipe. (This is The Rise of Scourge)
So, was that his 'revenge'? Or was it something else? Post your ideas in the comments :).
-Cloud 9 The Clock is TICKING! 15:35 Sat Dec 7