Suzie Plakson

When Ted attends his mother's wedding, he is disturbed by her overly affectionate relationship with her fiance.

Lily's long-lost dad shows up unannounced on Thanksgiving Day. She confides the real reason she stopped speaking to him three years ago, as she and Marshall disagree on how they should deal with the dispute.

Ted and Robin are surprised to run into Barney when they volunteer at a homeless shelter on Thanksgiving.

Marshall and Lily worry that Lily will never fall pregnant. To allay their fears, the couple visit a specialist who bears an uncanny resemblance to Barney.

Booth and an Iraq war veteran, Walter Sherman, investigate the death of a maritime museum security guard whose remains were found in the Florida Everglades; the attempted theft of an antiquated nautical chart is linked to the case.

Barney declares February 13th a holiday for desperate women; Marshall receives a Valentine's Day surprise from Lily; Zoey and Ted work on figuring out their relationship.