After Stella accepts Ted's proposal, Ted realizes he knows shockingly little about his bride-to-be. The two spend time getting to know each other better, and Ted tests their true compatibility by having Stella watch his favorite movie, Star Wars, which she has never seen before. Meanwhile, Lily learns Barney has feelings for Robin that he has been keeping bottled up all summer. Thrilled with the new, warmer Barney, she sets out to help him express them.