Erica is on strained terms with Kai because he had sex with Sam after she told him to look after her. It doesn't help when Erica tries to avoid him, but still runs into him both in her professional and personal life. She's not sure what the connection is to her current problems, but Dr. Tom decides to send Erica back to a time in high school when she and Leo had a house party, which resulted in Gary's beloved "mid life crisis car" getting trashed. Gary was never more angry with her than over that incident, and his and Leo's relationship never recovered. In going back, Erica believes that Leo's blind loyalty to his friend Robin is the cause of the car getting destroyed and for Leo and Gary's fallout. But Erica ultimately learns to see the truth behind the façade. She has to apply that truth when Kai asks her a question.