Evie (Tori Anderson) is a risk-averse quality-control assessor, who appreciates order until she meets charming, free-spirited Xavier (Joshua Sasse), who encourages Evie to carpe that diem, because he believes humankind has a mere eight months and twelve days until a runaway asteroid smacks us all into stardust. That's why he made an Apocalyst – a tally of every last thing he wants to do before the world goes kaput. So with the help of her friends, Evie must decide whether Xavier is certifiable and whether that even matters, if being with him means living her life more fully.

Xavier's escaped convict cousin wants to move in with him; Evie faces the possibility of losing her job; Hank helps Timothy try to win back Evie.

Evie wonders if Xavier might be crazy after he gets arrested for his attempt to publicize his apocalypse theory.

Evie decides to test her personal boundaries when she meets Xavier's free-spirited friend, Tuesday; things between Hank and Deirdre begin to heat up.

Evie tries to patch things up with her former best friend, Fern; Xavier realizes he should tell Evie how he truly feels about her.

Xavier's unsettled debts catch up to him; Evie tries to mend the rift between her parents; Kareema makes an unexpected new connection; Hank discovers an intriguing secret about Deirdre.