S1, E13: Mid-life Alex contemplates getting back together with his ex-wife, Sarah (Allison Tolman), when she visits for Abby's birthday party. Also, Young Alex attempts to move on from his crush on Nori by inviting his lab partner, Julia (Cree Cicchino), to the dance, and Older Alex makes one last-ditch effort to keep Eleanor from leaving Los Angeles with her fiancé.