After Solomon saved Lance and Ilana from General Steel, three nearly-indestructible Mutraddi beasts were sent to ravage the Earth. Lance, Ilana, the US army, and G3 must set aside their difference to defeat the trio of giant creatures.
General Steel unleashes his newest dastardly creation in the form of his own giant killer robot, and faces the team of heroes to scramble in order to find a way to defend themselves and the planet without the aid of Octus.
Solomon and his team land at a heavily damaged space station when they are attacked by a burst of energy. Meanwhile, Octus is thrown a surprise birthday party by Lance and Ilana. During the party, Octus receives a distressing call from Solomon that requires Titan's immediate assistance. Titan arrives at the space station and are able to survive one encounter with the creature thanks to Solomon. He explains it is a creature made of pure energy and when it drains the energy of something, it cannot be recharged. As they flee from the creature, Octus is hit by the creature in his leg, and cannot fix it. The gang then decide to contain the creature instead of destroying it. Lance and Solomon head towards the creature while Octus and Ilana hide. They manage to trap the creature temporarily, until Solomon's ship arrives. All of them escape, except for Lance due to the cable breaking. Octus saves him but is drained by the creature. When they try to recharge his mainframe it fails, and after an angry Lance uses Solomon's ship to destroy the station and the creature within, he, Ilana and Solomon mourn Octus' death.
Ilana is homesick, so she joins the Homecoming Dance Committee and creates a Galalunian-themed dance. Meanwhile, General Modula's continued failure to kill the princess is spreading across the galaxy. Modula is approached by an alien who guarantees on his own life that he has a creature that will kill Ilana and crush the Galalunian People's spirit. As our three heroes try to prepare for the dance, Lance and Kristin go a little further in their relationship via a karate bout, but she declines his request to join him at the dance. Issues arise when the Mutraddi arrives just as they depart for the dance. Titan at first fares poorly, as Octus and Ilana are distracted by missing the dance, and making Kimmy cry. However, Lance's lack of concern for their feelings pushes Ilana over the top, and the alien is soundly defeated.
Flashback to the day the King of Galaluna was overthrown by the Mutraddi. Lance was the first to catch on to the betrayal while Princess Ilana and her loyal bodyguard try to make it back to her father.
Lance learns how to play the guitar, and General Steel sends a spy to Sherman High whom Octus convinces that there is connection between Titan and the school. A dragon-like Mutraddi, which was defeated earlier by Titan, comes back as a severed head during a concert but is destroyed by Illana and Octus with a hologram of the Manus armor, to give Lance an alibi with the General being at the concert.
As the world seems to come to an absolute standstill, Octus searches for the cure to stop the disease that can affect humans and animals.
Lance, Ilana, and Octus go deep in to the swamp to find a Mutraddi that has crash-landed in the water. They investigate the wreckage and are attack by an amphibian-like Mutraddi that, after a seemingly easy kill, is able to bite Ilana and escape. Very slowly she transforms into the creature and attacks an alligator that was also mutated. Lance and Octus discovered that if they kill the original Mutraddi she might turn back to normal. After a short battle they killed the original Mutraddi turning Ilana back to herself.
An annual party celebrating a local legend gets interrupted by a shape shifting alien. Meanwhile Newton continues to explore his relationship with Kimmy.
Lance, Ilana, and Octus travel to a foreign planet to rescue a Gallunian prisoner.
Kimmy, the head cheerleader, forces Octus (as Newton) to tutor her after she fails a test, where things take an unexpected turn of events. Meanwhile, a Mutradi monster lands in the city where Lance and Ilana come across it but are unable to activate their mech suits.
When Modula finds another deadly beast to unleash upon the group, Lance, Ilana and Octus find a cuddly little alien they kept as a pet. However, they soon discover that the cute creature isn't all what it seems. The creature is generating enough energy to wipe out Earth, so the trio reluctantly let their beloved pet die peacefully in a glorious burst of energy. At an astronomy center, Octus locates a nebula cluster where they let their pet go, which the scientist of the station allows them to name for discovering it. In agreement, they come to name the cloud Tashy 497, as a mix of the names they wanted to name the creature.
Lance looks back into his childhood years before he was chosen to be one of the Galalunian soldiers.
The group must protect their fellow classmates without the aid of Sym-Bionic Titan when a huge tar creature manages to infiltrate Sherman High School and traps everyone inside the building.
The group comes face-to-face with their deepest fears when a deadly alien being attempts to use their worst nightmares against them.
When Lance becomes fascinated by the cars, he gets into a vehicle racing challenge against one of the competitive Earthlings.
Lance takes up being a vigilante and an intelligent roach-like Muddradi assassin comes after the princess. Lance's exploits are on the news without people knowing it was him, and Octus warns Lance not to take Earth laws into his own hands.
In an attempt to fight the titan, General Steel and his men seek out an extra terrestrial weapon. Meanwhile, Lance and Ilana discover the importance of teamwork.
Ilana suggests that they decorate their new home to fit in to the neighborhood, but as they enter the city's mall, Lance has a hard time adjusting the new life while protecting the princess...
Three aliens (Lance, Ilana, and Octus) crash-land on Earth while fleeing the evil general that has conquered their home planet, Galaluna. Shortly after, the general sends one of his minions after them, and they must fight the creature.
