Now that Riley has new friends, and a new house, things are going good inside Riley's head. But then new emotions are born. There's Pride, Laughter, Surprise, Frustration, Passion, Shame, Wrath, Calm, Jealousy and Trust. But a nightmare subconscious is born named Hex. That wants revenge on headquarters and tries to destroy one of the islands and things go terribly wrong. The emotions try to fix it while the other emotions try to make Riley happy. Joy and her friends meet a long-lost emotion named Courage and stop the madness from Hex.
Meanwhile. Riley meets a new kid named Nate and becomes friends with. And that means Riley's parents have to become friends with Nate's parents.
