In episode 1, Shun is seen competing in a battle in Bakugan Interspace with Ventus Hawktor as his partner. He is ranked the second best brawler in Bakugan Interspace, right between Dan and Marucho. Shun still seems to distrust Ren.
When Fabia appears and battles Dan, Shun is the first to suspect that Ren's story about the Neathians attacking Gundalia is not true. After Dan defeat Fabia and she leaves, Shun finds her and asks for her side of the story.