Robin's father is back but before Barney can discuss marrying Robin he reveals he has a new love in his life. When Robin learns he is married she threatens to not invite him to the wedding. Ted meanwhile assumes the role of wedding planner stealing Lily's thunder. They battle over the entertainment for the reception, but end up having a heart to heart about what is really troubling them both. Little Marvin battles constipation but gives his dad a big surprise in the end. Ted runs into Cindy who tells him about her ex-roomate's band who Ted ends up booking for the wedding.