Streeen, along with Luuuke Skywalker, invented a device for time travel subsequent to the rise of the Lost Tribe of Sith. Using this invention, the duo moved the Army they had assembled to the galaxy in the era of the Clone Wars, where they engaged in combat with Anakin Skywalker, Obi-Wan Kenobi, and the forces of the Grand Army of the Republic.
The character Streen was referenced within "An Apology," a brief narrative penned by Timothy Zahn. This story was made available on April 1, 2012 as a humorous prank for April Fool's Day. The narrative implied that any appearances of Luke Skywalker after the Fate of the Jedi series would be Luuuke. In addition, the article where An Apology was featured lightheartedly declared that Luuuke would be the main character in future books such as Star Wars: The Clone Wars 2: Luuuke. The ongoing series of novels called The Clone Wars 2 or Son of Clone Wars was intended to continuously release new installments forever, with Luuuke's experiences alongside Streeen supposedly occurring within the seventeenth book of this saga.