Mark's birthday party for Hannah brings good - and very bad - surprises. Kate digs into Sophia's past. Rebecca plays hardball with James.

The One Season 1 Episodes...

• s01e01 - Season 1, Episode 1
• s01e02 - Season 1, Episode 2
• s01e03 - Season 1, Episode 3
• s01e04 - Season 1, Episode 4
• s01e05 - Season 1, Episode 5
• s01e06 - Season 1, Episode 6
• s01e07 - Season 1, Episode 7
• s01e08 - Season 1, Episode 8

The One Show Summary

In the future, a simple DNA test can find everyone's perfect partner. As five more couples set to be arranged by science, the story follows what happens when the person you're meant to be with has dark secrets and even deadlier intentions.