Deena Shan is based on expanded universe stories and was never seen in any of the Star Wars movies. Luke is based on the comic book appearance in the Rebellion series.
Luke receives a message from his old friend Janek Sunber, a lieutenant in the Imperial Army, saying he wants to join the Rebellion. Everyone thinks it’s a trap except Luke. The Jedi goes on an unauthorized mission to find Sunber and is joined by Deena Shan, who is looking for adventure, and a chance to prove her worth.