When Robin rekindles things with an old flame, he crushes her again, but Barney, in his own inimitable style, helps her realize that she is awesome.
When Barney finds a copy of the Canadian kids show "Space Teens" starring Robin's alter-ego "Robin Sparkles," the gang learns more about Robin's past as a performer than they expected.
While Barney prepares for his wedding to a mystery bride, he and Ted reminisce about Punchy's wedding, including when Marshall and Lily announced they are having a baby. Meanwhile, Robin considers telling Barney she has feelings for him.
When Marshall and Lily receive shocking news, it has a profound effect on the gang and forces them to reexamine their own lives. Meanwhile, Robin gets a new job, Barney discovers the joy of giving on Christmas and Ted begins his duties as Best Man for his old friend Punchy's wedding.