Khloé invites her ex to True's first birthday party. Khloé decides to throw Kourtney a birthday party, but Kourtney's anxiety about turning 40 threatens to ruin the celebration. Kim receives a devastating medical diagnosis that could change her life.

After an uncomfortable confrontation with her ex at True's first birthday, Khloé must figure out how to coexist with her ex. Kim accuses Kourtney of copying her style. Kim searches for answers regarding a frightening medical diagnosis.