1x10 - La Brea

: During the struggle to rescue Isaiah from Silas, Marybeth is fatally stabbed. She dies in her son Lucas's arms just as they were finally reconciling their strained relationship.

: Just as the future is secured, the portal pulsates unexpectedly, snatching Josh , Riley , and Lilly away from 10,000 B.C. and transporting them to an unknown time (later revealed as 1988). La Brea 1x10

: In the modern day, Gavin, Izzy, and adult Lilly (Ella) locate a final, smaller sinkhole in Seattle. They take a literal leap of faith and successfully land in 10,000 B.C., where they are immediately greeted by a woolly mammoth. : During the struggle to rescue Isaiah from