Alice double dates with her parents as teens. Kat's first visit to the past brings a surprising discovery. Del swallows her pride to ask for help.

Kat chaperones a school dance and reconnects with Brady. Alice wants Nick to find her in the future. Del says goodbye to more memories as a landmark closes.

Alice goes to a New Year's Eve Y2K party to support her friend. Kat finds a new mystery about her father, while Del reveals an old secret about him that's troubled her.

When an old friend returns, Alice realizes her relationship has no future, and Kat is shocked by family secrets. Del tries to take a chance with Byron.

Kat and Alice travel back to 2000 together to attend Colton’s  funeral. Elliot tells Kat she should share with Alice the truth about her visits to the past. Meanwhile, Del goes to the grief group and makes peace with her memory of Colton. Kat has an epiphany that sheds new light on Jacob’s disappearance.