2 - Enter the Island Fortress! Metropolitan X on the Brink of Danger! (SUB)
Penny and Lotta are captured by helmet worms and taken to the enemy's secret base. With time running out on the hostages and humanity, Captain Clayton and James attempt to destroy the alien's advanced weaponry.
3 - The Invaders & Their Evil Powers Firing Up the G-Reaction Engine! (SUB)
Captain Clayton and James are wounded in a surprise terrorist attack, and Penny is crushed to learn the identity of the bomber. As alien forces turn deceased hostages into weapons, G-Reaction engines all over the world mysteriously fall silent.
4 - The Alien's Trap! Do You Read Us, Invincible?! (SUB)
The world's most brilliant minds fail to find a reason for the sudden incapacitation of all G-Reaction engines, but Lotta solves the problem with one false step. Armed with this new knowledge, Penny and Billy undertake a daring rescue mission.
5 - Extreme Offense, Extreme Defense Solving the Mystery of Element X! (SUB)
Ace pilot James leads a desperate attempt to destroy the alien base and prevent planet Earth from entering a new ice age. Elsewhere, Billy uncovers an extra-terrestrial mind control plot, and Penny searches for clues about Element X.
6 - Enter the Super Weapon! The Last Battle for Earth! (SUB)
Penny and Billy work together to find the hidden location of Element X and launch a last-ditch effort to destroy the alien planet's navigation system.