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.
A Jedi Master is missing. She is trapped in a hostile fortress.Qui-Gon Jinn, Obi-Wan Kenobi, and their fellow Jedi are her only hope. The rescue has begun.