VIDEO: Sneak Peek - Frances Conroy Guests on Tonight's HOW I MET YOUR MOTHER

On tonight's episode of CBS's How I Met Your Mother titled 'The Lighthouse,' when Robin and Loretta's conflict escalates, Barney is caught in the middle.

Meanwhile, Marshall and Daphne deal with a stowaway on their road trip, and Ted and Cassie try to enjoy a trip to a lighthouse. The episode airs tonight, Monday, Nov. 4 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Frances Conroy returns as Barney's mother, Loretta, and Anna Camp guest stars as Cassie, Ted's weekend date. Get a sneak peek below!

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.

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