A lost earring means Andy must go on another time-travelling adventure, as he returns 160 million years into the past to hunt for a prehistoric clamshell. Plunging into the waters of an ancient ocean, Andy meets some giant swimming reptiles and helps them to escape a colossal creature called Predator X.

Originally released by BBC, 2016. Streaming video file encoded with permission for digital streaming by Infobase on November 17, 2016.

Kimmerosaurus Exhibit (3:25); --Marine Reptiles (3:59); -- Prehistoric Shell (3:14); -- Just in Time (1:46); -- Credits: Kimmerosaurus and Clamshell: Andy's Prehistoric Adventures (0:25);.