S1.E5 ∙ Deunited/Great Debates with the End of Time/The Forever Five

During a cryogenics test, a pilot frozen in 1939 awakes in 1992 but time is running out, as his body starts to age rapidly.

As his last assignment, a temporal agent is tasked to travel back in time and prevent a bomb attack in New York in 1975. The hunt, however, turns out to be beyond the bounds of possibility.

Since losing her husband, Sophie has struggled to manage grief, a full-time job, and parenting her devastated daughter, but when a former physicist reveals a secret time-bending machine, Sophie will be faced with an impossible choice.

Four friends/fledgling entrepreneurs, knowing that there's something bigger and more innovative than the different error-checking devices they've built, wrestle over their new invention.

While he is on a cruise ship, the math whizz Wu Yu (Jin Han) meets a woman named Tan Jiao (Li Yi Tong), who writes web-based mystery novels. They hit it off and begin to develop romantic feelings for each other. But after the journey is over, they both suffer differing amounts of memory loss. Wu Yu's life is also turned upside down when his sister is killed and his mother dies shortly after. The two meet again by chance after many months apart, but things have changed for both of them. Wu Yu has become an auto mechanic who spends his time in melancholy - and trying to get to the bottom of what happened to his family. Tan Jiao does not immediately recognize him, but still feels the pull of attraction toward Wu Yu. But as they try to work out what happened to their memories - and search for the person who killed Wu Yu's sister, they begin to wonder if something very strange happened on the cruise ship.

Evan Treborn suffers blackouts during significant events of his life. As he grows up, he finds a way to remember these lost memories and a supernatural way to alter his life by reading his journal.