BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
Bug swarms, space slugs, brains on legs, mad Imperial scientists--Zak has had enough! He's glad to be on board the luxury space yacht, Star of Empire, where at last, there's peace and quiet. Until--"Abandon ship! Critical meltdown!" As a blaring siren sounds, panic-stricken passengers rush to get off the ship. Everyone evacuates...except Zak and Tash. But to their relief, nothing happens. There's no meltdown, no explosion. Everything is fine. Except that the ship's exits are sealed and all communications have been shut down. Zak and Tash are trapped. And they are not alone.