Suzie Plakson

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

Afraid they will never get pregnant, Lily and Marshall decide to see a specialist; Robin begins her new job.

When the gang views a tape from Barney's ex-girlfriend, everyone must share their most embarrassing moment in order to get him to tell the full story about the tape.

When Barney prepares a comprehensive prenup, the other guys decide to propose relationship amendments to their significant others; Quinn is furious and makes a prenup of her own.

Marshall, Lily, Robin and Kevin celebrate Valentine's Day with a weekend in Vermont; Barney meets his match.

When Zoey's naive cousin (Katy Perry) visits, Barney makes a move on her; Ted comes to grips with his feelings for Zoey.