The first half of this episode starts off with the Tyrusian king Cale-Oosha making the trip down to Earth, expecting to begin peaceful relations with the humans. His uncle, the Dragit, however, had set up a secret underground base in the Utah desert witht he plan to conquer Earth. Cale-Oosha forbids such a plan and barely manages to escape with his life and his friend and bodyguard Rafe. He is rescued by Rita Carter, a human who just happened to wandering the desert in her Jeep that night. While they are resting in a cave, they are attacked by a mangler- a Tyrusian species that looks a bit like a small, vicious dinosaur. Cale strangles it/breaks its neck; shortly thereafter, Rafe finds them. Rita takes them in as they have no where alse to turn.

A few years later, Rita and Cale are living in a small town in Massachusetts named Glenport. They are still together and have managed to have a little boy, David. Cale however is called off to lead the fight against the Dragit. He orders Rafe t

David Carter learns about his heritage and the danger he is in the hard way when he is attacked by telekinetics, and mysterious ""Tall Men"", and sees his house and mother dissappear in a ball of light.

Rafe leads an Ooshati attack on the Dragit's base, seeking to avert the imminent invasion. David is ordered to stay behind, as survival is unlikely.

Alone in the Utah Badlands, David is attacked by a Mangler, who fortunately turns out to be the pet of a former Tyrusian soldier who ""went native"".

David returns to Maple island, and directs an Ooshati ship to destroy the secret base that is flinging meteors to earth.

David is seemingly pursued by enemies on all sides. A telekinetic showdown with Simon and Sonia is going well, until the Tall Men show up.

The next thing he knows, David is being awakened on a ship approaching Tyruse. Here he is met by the Dragit who tries to gain his alleigence.

After his escape, David contacts the only people who he can count as allies. Together they formulate a plan to warn the President.

General Gordon places numerous obstacles between them and the President, delaying them in their mission. Eventually they break through, but are they too late?

Doc eventually manages to contact David, and they arrange to meet. The Tyrusian renegade has a plan to defeat the Dragit's invasion, but they will have to work together.

As General Gordon continues to pursue them, they infiltrate the Cape Kennedy space center with the help of an insider. .

David and his allies arrive at the moon base, determined to destroy it. However surrounded by enemies, all does not go according to plan, and with The Dragit fast approaching time is running out. .