Melanie fights for survival in treacherous conditions, vying to do what others before her could not.

On the run from the enforcement agency, Tae-sul and Seo-hae give in to the time traveler's request that they make a stop at his mother's house.

Tae-sul's presentation at a conference gets a violent interruption. He and Seo-hae make a narrow escape, but more trouble soon follows.

The contents of a mysterious suitcase give Tae-sul more questions than answers. In exchange for lottery numbers, Sun agrees to help Seo-hae.

Aboard a falling plane as the clock ticks toward doom, Han Tae-sul puts his famous mind to work for a solution. Gang Seo-hae arrives in the year 2020.

Archie, Betty, Veronica and Jughead prepare for their first day as Riverdale High's newest teachers. Veronica introduces her husband Chad to the group after he shows up unexpectedly in Riverdale. After realizing they are out of funds, Archie and Toni turn to Cheryl for help restarting the football and cheer teams. Finally, Betty, Kevin and Alice follow a lead after learning that Polly may be in trouble.

After tragedy strikes the Boulder Free Zone, Mother Abagail tasks members of her Committee with a dangerous mission. Meanwhile, Harold and Nadine begin their journey to New Vegas to unite with Flagg and claim their reward.

Risking everything, the Boulder travelers face off with Flagg's followers in New Vegas, among them a very different - and pregnant - Nadine.