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On their way to Long Island for their wedding weekend, Robin and Barney come across a startling family discovery. Meanwhile, Marshall sees something online that changes the course of his journey east, while Lily confronts Ted about letting go of Robi... (more)n.

Alex Scott, Marshall Manesh, Michael James Bell, Rudy Villagrana, Sherri Shepherd, Suzie Plakson, Wayne Brady, Wayne Temple