Coop and Megas are out in space, doing some combat training. After destroying several asteroids, Coop creates a giant stone replica of Megas. Kiva scolds Coop & Jamie about taking training seriously. Coop responds that he just wants to have a little fun. Kiva remarks that there is nothing fun about the Glorft and that if Coop is not careful the Glorft will defeat him. Kiva also remarks how Jenna at least follows her instructions and that she's a better pilot than Coop is. Coop shrugs this off by saying that they have their own way of handling things.
Megas than gets struck by a giant asteroid. It makes an emergency landing on the planet Romos, a planet similar to Earth's atmosphere. Upon landing, they are immediately arrested by Krutus, the Captain of the royal guard. The Megas gang are then brought to the ruler of Romos; King Mikey. He is portrayed as a ruthless dictator with zero tolerance for lawbreakers.
The King, cloaked in shadow demands that the three pay for their crimes with execution. However, the King trips and falls, revealing himself to be a child no older than 10. Coop & Jamie think that this is a joke. However, the King is a spoiled narcissistic brat. King Mikey demands that Coop, Jamie, and Kiva pay for their crimes. Coop refuses & makes a break for it, only to be attacked by the king's robot guards. It is also revealed that King Mikey has an amulet that controls all of the robot solders on Romos. Coop, Jamie, and Kiva are taken to the dungeon.
In the dungeon, Coop & Kiva argue about trying to escape, when Krutus appears him and tells them that they will most likely be executed. Coop asks where the real King is, Krutus responds that Mikey is the real king and that his parents, the former King & Queen were killed when their ship was hit by an asteroid. Mikey was the only heir left. However, he became intoxicated with the power it came with. Coop says that he will stay and stop the King, but Krutus doesn't want any more trouble. The king then demands an audience with the Megas crew.
They are brought before the King once again. King Mikey states that he is impressed with Coop's defiance. He decides to allow the gang a chance to fight for their freedom. At first Coop refuses, but after some more taunting from the King, Kiva accepts on Coop's behalf. Kiva tells Coop that this is just so she can have more time to find Megas and escape.
Coop, Jamie, and Kiva get changed into gladiator like attire and enter the arena. They grab weapons that are adorned on the wall. They must fight at least 1,000 small robot solders that use various weapons. After that, they will need to fight the Magnos, a giant robot that is considered to be the most powerful on Romos. They also see Megas is on the other side of the arena.
The fighting begins. Coop & Kiva are able to hold their own. However, Jamie constantly runs away . He sometimes gets lucky and the solders he fights end up destroying each other. During the battle, Kiva complements Coop on his ability to fight.
King Mikey cheats, and activates the Magnos early. Kiva distracts the Magnos while Coop & Jamie go to get Megas. While surrounded by robots, Coop throws a spear and hits Megas, activating its auto defense system. This allows Coop & Jamie to get to Megas.
The Magnos grabs Kiva and crushes her in its grip. She is saved by Megas. Megas and the Magnos fight. Krutus tells King Mikey to stop the fight as innocent people are going to get hurt. King Mikey refuses, saying he wants to see the Megas gang destroyed. Megas is able to defeat the Magnos. King Mikey then summons more giant robots to the arena to stop Megas. Megas however grabs the king and puts him in the line of attack. The King then begs for mercy. Megas manages to take the amulet from Mikey. Krutus then has Mikey arrested. Krutus is made the new emperor. They throw a feast in Coop's honor.
