Clayton Phipps and his son Luke put it all on the line for a risky raptor fossil buried under 30 feet of earth. And the Harrises decide to go for broke to prep their multi-million dollar T-Rex skull.

Clayton and Luke begin to excavate the deep overburden that covers the T-Rex site. And while Mike Harris travels to Utah to prep the Cowboy Rex skull, Aaron, Jake and Tori think they're on a bucket-list discovery at the Duckbill site.

When a wildfire surrounds his hometown, Clayton Phipps drops everything to help fight the flames. The Harris-Bolan crew excavates a new Triceratops' site. And the Abercrombie family discovers a Mammoth fossil map on their ranch in New Mexico.

Hoping to salvage his season, Clayton Phipps hunts for valuable Trike horns, while Mike Harris and his team believe they might be on to a world-record find. And fossil hunter Andre Lujan follows a 90 year-old map to a massive mammoth site.

Clayton Phipps makes a shocking discovery at the Trike site. The Harris-Bolan crew unearths what they believe might be an extremely rare Ceratopsian. And on the Abercrombie ranch, Andre Lujan digs up an enormous Ice Age Mammoth tusk.

With winter looming, Clayton and Luke race to excavate two massive trike skulls, while the Harris-Bolan crew searches for a crucial missing femur for their rare ceratopsian. On the Abercrombie Ranch, Andre discovers a mother-lode of Ice Aged bones.

When a valuable fossil is trapped in a precarious location, Clayton brings in a team of horses and a helicopter to help extract it. Mike comes face-to-face with Cowboy Rex, and Andre makes a difficult decision to save the Abercrombie's mammoth.