Desperate to reunite with her son, Eve follows a lead that brings her face-to-face with a ruthless prehistoric group. Gavin, Izzy and Ella question whether they're fit to survive in 10,000 BC. Josh and Riley wake up in an unfamiliar time.
 

After an emotional reunion, Gavin and Eve attempt a daring escape from their unforgiving captors. Lucas leads a dangerous mission to the fort to reclaim the resources his friends so desperately need.