When heavy rains create a mysterious ""new water"", Littlefoot sets off to explore the Great Valley. He quickly becomes friends with Mo, a prank-playing dolphin-like creature who can't find his way back to the Big Water. Littlefoot and his pals come to the rescue and prove the value of courage, friendship, and diversity.

Based on the character created by Judy Freudberg and Tony Geiss. Special features: games; sing-alongs; jumpstart jukebox; Big Water adventure game demo; ""Land before time"" PS2 game trailer; printable coloring pages.