During the events of '"What Ever Happened to Della Duck?!", Lunaris and Penumbra first encounter Della Duck struggling against a Moon Mite. But during the fight, he comes to realize that the Moon Mite had been attacking them the whole time because she was trying to find scraps of metal as food for her and her baby. Lunaris was impressed to see Della handle the Moon Mites, and thanked her for getting them to leave without any more fighting. Seeing that Della's rocket ship had been ruined, he invites her to come to their home on the Moon.
As they arrive, Della was surprised and infuriated to realize that a hidden city had been on the moon this whole time, with structures made of gold and Lunaris stating that it was the city's most plentiful resource. Penumbra was angered at Lunaris for allowing an Earther to have access to their resources in the city, believing that he had gone "earth soft." Even so, Lunaris reminds her that Della was able to take down one of their greatest enemies as if it was nothing, believing she had the potential to be useful to them in the near future.
Months later in "The Golden Spear", Lunaris showed Della around the city of Tranquility while also reminding her that his offer still stood for remaining in Tranquility until she was able to fix her ship. However, Penumbra continued to share her suspicions of Della with Lunaris, believing she had further motives than she was letting on, but Lunaris only assumed she was just jealous of her. Lunaris also explains to her that his father, General Meridian was terrified of Earth to the point where he thought keeping their society hidden was the only way for peace, and claimed he wasn't willing to fear them his whole life while also asking Penumbra if Della truly looks like an actual threat. Seemingly feeling sorry for Della at her needed rest while continuing to repair her ship, he ordered Penumbra to let Della stay at her home until her work on the Rocket was complete.
Noticing that Penumbra was still continuing to act hostile towards Della by her back, Lunaris continued to request that no harm must come to Della during her work and that her interactions with other Moonlanders were simply a way of introducing their people to her own cultures on Earth. While on the topic of culture, he also expressed his fascination with the rocket itself after having come across an invention that can take them into space. Later, as Penumbra had started the rocket ship's engines and forcing Della to leave early, Lunaris interrupted their conversation by requesting the rocket ship manual, claiming if they built ships of their own, then, they could still come and visit Earth, to which Della agrees.
Once Della had taken off from the Moon, Lunaris shot himself in the arm with his zapper gun; much to Penumbra's surprise. As the other citizens ask about what had happened, Lunaris claimed that Della had betrayed them all and that she was only telling them intriguing stories to manipulate them into helping her repair her ship. He also stated that Della was merely the wave of a first attack and that if they wanted to outmaneuver them, they had to invade first and build their own rocket ships with the manual he retrieved.
Penumbra later asked Lunaris why he lied to their fellow Moonlanders about Della and replied, believing they simply needed a reason to fight, which was a betrayal. With Penumbra fearing for the sake of their people, she questioned whether this plan was a good idea, but Lunaris shouted back, saying that he wasn't going to live in fear like his father did and that instead, he was going to ensure planet Earth feared him instead.
One day after Della's departure in "Nothing Can Stop Della Duck", Lunaris notices that Della's ship had returned to the Moon, but this time with a different person inside. He claimed to have come in peace, but Lunaris nevertheless ordered Gibbous and Zenith to seize him.
In "Whatever Happened to Donald Duck," Lunaris uses Donald's speech problems to spread his propaganda and further his narrative that the earthlings are coming to attack the moon. Furthermore, it is revealed that Lunaris has been intercepting communications from the earth and been planning his war in secret for far longer than when they first met Della. Lunaris also planned for targets who could be potential threats to his plans such as Flintheart Glomgold, Scrooge McDuck, Magica De Spell, and others. He even attempted to build his own cannon like transporter to earth but it was a failure, which is why he needed the plans for Della's ship. He enrages Donald when he reveals the triplets are his main target, as he believes killing them will break Scrooge emotionally and make his invasion's victory assured. Ironically Donald then escapes back to earth in Lunaris' failed prototype with Lunaris dismissing him as being unable to survive the trip.
In "Moonvasion", Lunaris begins the invasion with his forces rounding up civilians across Duckburg and seeing through every one of Scrooge's contingencies such as the Unstoppa-Bomb. First communicating with Scrooge on the Money Bin frequency, Lunaris announces his intentions to kill the children to weaken their spirits and seemingly lands his ship on McDuck manor. However, this was later revealed to be a ruse as his extensive preparation had allowed him to counter every one of Scrooge's strategies and keep him distracted. While McDuck's army was caught by the moonlanders, Lunaris landed his planetary engine; a gigantic version of the Spear of Selene designed to force the earth from its orbit and make it revolve around the moon (freezing it in the process).
But Lunaris' plans began to unravel when Scrooge in desperation turned to Glomgold for help, whose subsequent evil scheme threw Lunaris off his game as he couldn't prepare for the mind-blowing weirdness that was part of the Mcduck's life. Glomgold's ridiculous plan succeeded in weakening one of the planetary engine's main support beams (as it was so big that losing even one would cause it to fall over). Scrooge's family arrived (on Feathry's giant krill Mitzy) and finished the work destroying the beam. Lunaris was forced to pilot the planetary engine back into space.
Enraged, Lunaris proceeded to simply try to blow up Earth by ramming it with his ship to the core (exposing his true nature to his own people in the process). Though the McDuck family took out most of his guns in one of the moonlander ships, he traps them with his prepared backup guns and tries to burn them with his engine. The timely arrival Penumbra finally took out his main engines. Lunaris had prepared backup engines but their circuitry had been eaten by one of Glomgold's sharks. Selene then appears and informed him that Storkules was using his super strength to put the Earth back into orbit. To his horror, he finds his broken ship has been pulled into the earth's orbit. In essence, he is now trapped as the earth's second moon.
Lunaris treats Della as a friend, even during his awareness of Penumbra remaining openly suspicious of her. He acts as a character who refuses to live by fear over anyone he considers an enemy or simply gets in his way. In reality, he was using Della for his own goals, and rather than not wanting to live in fear he is obsessed with it and is determined to make all his enemies live in fear of him.
After Della leaves the Moon, he reveals his true colors to Penumbra thinking that her ideals are equal to his, but also believes it to be necessary to manipulate his people if it means they will stand by him for his own personal intentions.
Lunaris' true nature is that of a ruthless tyrant who is more than willing to betray friends and murder children for his victory over the earth. When his plan is upended, the full scope of his hatred and madness is shown; as he attempted to blow up earth despite the fact that most his people were on it at the time.
In keeping with the main theme of family in the show, Lunaris is shown to have father issues. He was frustrated with his father's way of living in hiding from the inhabitants of Earth, as his intentions are eventually revealed to have Earth fear him instead. This is likely to prove for himself both his dominance among the Earth inhabitants and that the "planet moon" will be the greatest planet of all.
Meridian was Lunaris's father who hid from the sight of Earth out of fear of invasion. Lunaris began to plan goals different from his presumably deceased father.
Penumbra is Lunaris's most trusted lieutenant proving to be a great pair of combatants while fighting the Moon Mites. However, when he sees she is not supportive of his war, he gives her a medal set to paralyze her when she attempts to stop his plans. This betrayal came back to haunt him when she landed the decisive blow to finally end his rampage.
"You may not be able to go home, but that doesn't mean you can't make a new one, with us."
"That Earth-dweller managed to defeat our greatest enemy like it was nothing. She could be useful."
"See that rock? My father General Meridian was terrified of it. Claimed to have seen mysterious objects launched of it. He was so afraid that he drove us into hiding underground which allowed the mites to become a problem in the first place."
"They needed a reason to fight, so I gave them one: betrayal."
"NO, I will not spend my life in fear of the earth like my father, the earth will fear me."
”I believe the words you're looking for are, Aww Phooey.”
"You see Scrooge, My father taught me that fear is a powerful weapon."
"If the earthers won't live in fear of the Moon, then they'll DIE in fear of it!"
- 7. What Ever Happened to Della Duck?!
- 11. The Golden Spear!
- 12. Nothing Can Stop Della Duck!
- 17. What Ever Happened to Donald Duck?!
- 24. Moonvasion!
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- Lunaris is an adjective that means "Of or pertaining to the moon"
- Lunaris was originally going to be given the name General MoonJohnny Lunaris.