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.

After Ted runs into an old girlfriend, he tries to make amends with her since he cheated during their relationship. Meanwhile, Marshall and Lily make a bet with Barney that could force him to wear Marshall's ducky tie.