A band of marauding Outsiders discovers a lost T-Rex temple and in it an artifact that has the ability to cancel out the protective power of Sunstones. Meanwhile, Karl and his stubborn father concoct a risky new plan to leave the island.
Catrone, the leader of the gang that found the artifact, realizes that he can now control T-Rexes and goes mad with power. Only his deputy, Le Sage, stands up to him. Marion and David must rescue Karl and his father, then save Dinotopia.
Karl and Marion need Le Sage's help to stop Cortez, an Outsider who kills Stegosauruses to perfect his rejuvenation potion. Romana, David's second in command, warns him that Portia, a young cadet he fancies, cheated on her flying test.
Karl and David find a shipwrecked dog and a boat stocked with cans of cola, burgers and a working radio that fascinates Dinotopians. Karl learns that the crew is still lost at sea, so he tries contacting the rescue party over the radio.
A Chasmosaur egg from the hatchery has been replaced with a T-Rex egg. A distraught woman named Iridia claims an Outsider child did it. Le Sage denies it but refuses to cooperate any further. Matriarch Rosemary questions Iridia's story.
An Outsider named Alano bullies David, so he plans to fight him. David's dad, Frank, who misses watching sports, suggests that they set up an actual boxing match. Rosemary agrees, after Le Sage promises she won't rig the fight.
Karl's date with Marion doesn't go well. A jolly conservationist named Lok shows him a rare and supposedly magical frog called Wartosa. In an attempt to change the outcome of the date, Karl kisses Wartosa and becomes stuck in a time loop.