Two alien teenagers and a robot, crash-land on Earth while fleeing the evil General Modula, who has conquered their home world, Galaluna. They try to blend in with Earth society, but Modula sends a fire monster to destroy the princess.
Posing as head of the Lunis family, Octus buys a house for Ilana. While shopping for furniture, Lance activates his power suit and attracts the attention of Modula who sends a five-headed robot to Earth.
When Lance and Ilana disagree about their combined fighting tactics, Octus watches "Animal Friends" to learn parenting skills. General Steel unleashes a monster when he orders tests on an alien rock.
Ilana starts a campaign for better food at Sherman High. A bored Lance begins fighting crime anonymously at night. Mutraddi assassin Xeexi has been sent to Earth to find Ilana and her companions and eliminate them.
Lance develops a rivalry with a street-racing gang leader named Mike Chan, also called the White Dragon. When Lance's rivalry gets him arrested, Ilana forces him to get a driver's license - legally - if he wants to race Chan again.
Both Ilana and Lance are being plagued by nightmares and visions of dread involving their respective fathers. Meanwhile Octus suffers lapses in his memory.
Titan defeats a giant blob from Mutraddi, but a tiny piece survives by sticking close to Ilana and ends up in her locker at Sherman High. It grows stronger and larger as Ilana auditions to become a Sherman High cheerleader.
Following the disappearance of his father, young Lance was sent to the Military Academy on Galaluna. There, he immediately encounters a bully called Baron and is soon competing against him to win the Medal of Excellence.
Modula dispatches the most explosive yet unassuming Mutradd creature to destroy the Earth. Titan stops it's decent and the three Galalunans adopt it, although everybody gives it a different name.
Head Cheerleader Kimmy orders Octus, in his human guise of Newton, to help her with a math test. Lance and Ilana leave the house and end up at a concert.
Solomon and his G3 men capture Ilana and Lance, with Octus in hot pursuit. After being interrogated in a top secret prison, the two young Galalunians escape with aid from the mysterious Drake.
Kimmy takes Newton to Sherman High's annual Scary Mary party and Ilana and Lance reluctantly go along. A Mutraddi shapeshifter lands in the woods nearby and infiltrates the party, disguising itself as various of the humans present.
The world comes to a standstill. Octus is the only being not frozen in place. He has to figure out the source of this phenomenon in order to free his teammates and every one else.
After watching school band "Disenfranchised" perform, Lance is inspired to pick up a guitar. General Steel has one of his men pose as a student at Sherman High to discover the secret of the Titan.
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.
Ilana proposes helps to organize the Homecoming dance and bases it's theme on the Galalunian Harvest Festival. Even Lance is forced to find a date since Octus/Sherman is dating Kimmy and Ilana is taking Jason.
A surprise birthday party for Octus is interrupted by a distress call from, of all people, Solomon. He needs help fighting a creature made up out of pure lightning aboard an abandoned space station.
Unable to defeat a Mutraddi menace without Octurs, Lance and Ilana have dropped out of school and are traveling the country in search of a way to recharge their robot protector.
Solomon offers help to the Galalunans and tries to reactivate Octus at G3 HQ. But General Steel takes this opportunity to launch an attack on G3 with his H.M.E.R., also known as "Hammer". In the middle of the battle, the Rift Gate opens.