A serpent is attacking oil refineries. After her father is killed in one of the earthquakes, Debbie Harland blames Mark for not being able to help him. Mark then needs to balance helping Debbie with saving other refineries.

7-Zark-7 discovers a new planet, which is called Zarkadia in his honor. G-Force learns that several mysterious plane crashes have been occurring on the planet, so Mark travels undercover to investigate.

Upon their splashdown on Earth, two astronauts are kidnapped by a Manta Ray submarine for discovering the location of Spectra bases on Mars. G-Force is called upon to rescue the astronauts and retrieve the valuable information they obtained.

G-Force is introduced and faces a challenge against one of Spectra's most mightiest machines, the Space Terrapin. To control the Universe, Spectra will stop at nothing to steal Earth's most valuable mineral: Vitalumis.