This season, the Harris family – Gavin (Eoin Macken) and Eve (Natalie Zea) and their children Izzy (Zyra Gorecki) and Josh (Jack Martin) – continue to find themselves separated in parallel worlds. In 10,000 BC, Eve is determined to find a way to reunite with Josh, who accidentally passed through a portal around the year 1988. But unbeknownst to Eve, Gavin and Izzy have moved from the modern world to prehistoric Seattle, and now embark on a dangerous journey to Los Angeles to reunite their family…