The Sinkhole
The show begins when a giant one of these opens up in Los Angeles, swallowing people and buildings.
What is a Sinkhole?
Survivors are shocked to see these giant, furry Ice Age relatives of elephants roaming around.
What are mammoths?
Eve Harris and her teenage son Josh fall into the hole, leaving this family member behind on the surface.
(Gavin) and (Izzy)
The sinkhole opens up right at the site of these famous, real-life gooey attractions in Los Angeles.
What are La Brea Tar pits?
The prehistoric world is filled with these extinct cats known for their long, blade-like upper teeth.
What are saber-toothed tigers?
Despite navigating the brutal terrain of 10,000 B.C., daughter Izzy thrives while using a high-tech prosthesis for this missing limb. Which leg
left leg
Survivors quickly realize the sinkhole is not just a hole, but a portal that allows this type of sci-fi travel.
What is time travel?
Human survivors have to look out for these massive, predatory flightless birds that hunt them.
What are terror birds?
Plagued by hallucinations for years, father Gavin realizes his "mental illness" was actually a series of these psychic glimpses into the past.
Visions
When the giant sinkhole opens, this green historic park surrounding the tar pits is completely destroyed.
What is Hannoc Park
In later seasons, characters are shocked to encounter these giant reptiles from a much older era, despite being in 10,000 B.C.
What are dinosaurs?
In a mind-bending twist, Gavin learns his real name is Isaiah and that he was actually born in this primitive time period.
10,000 BC