(from the publisher)Ben and his friends saw it first: an alien ship crashing to Earth. But when they race to the crash site, the ship blasts Ben seemingly out of existence. Now Gwen and Kevin have to come to terms with what they think is the loss of their friend - but they donít know what really happened. The ship transported Ben to an alternate world, the Fourth Dimension, where nothing is quite what it seems. But Benís not alone in this strange world: heís trapped there with the shipís pilot, an alien bounty hunter whoís been searching for the legendary Ben 10!