Ted and Barney try to convince Marshall his new girlfriend is crazy.
Ted discovers that his friends ditched their plans to stage an intervention for his engagement to Stella, but he is adamant that they go through with it anyway.
Marshall and Lily are less than thrilled when they hear that Ted's college girlfriend (Laura Prepon) has moved to New York.
Ted's friends try to convince him that he should not date his doctor by sharing some of their own toxic experiences.
The gang tries to help Ted when the perfect woman (Joanna Garcia) becomes available; Marshall finds a letter written by his younger self.