VIDEO: Sneak Peek - Final Season of CBS's HOW I MET YOUR MOTHER

On the final season opener of CBS's HOW I MET YOUR MOTHER titled "The Locket and Coming Back", 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 Robin, on a special one hour of the ninth season premiere episode of HOW I MET YOUR MOTHER, Monday, Sept. 23 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

Sherri Shepherd ("The View") guest stars as Daphne, a woman on the same flight aS Marshall; Roger Bart ("Desperate Housewives") guest stars as a hotel clerk; and Wayne Brady ("Let's Make a Deal") returns as Barney's brother, James.

 HOW I MET YOUR MOTHER, now in its ninth and final season, is a comedy about Ted and how he fell in love.  This season takes place over the course of Barney and Robin's wedding weekend, when the lives of the gang change dramatically. Ted is about to move to Chicago, Marshall and Lily are about to move to Rome, and Robin and Barney are about to become husband and wife. The series is narrated through flashbacks from the future.