At some point, Garmadon met Koko in a battle, and they fell in love. They eventually got married and had a child named Lloyd. However, Koko soon realized that Lloyd would grow up to be evil if he stayed with Garmadon, so she left Garmadon along with her son. Not changing to become a good father became one of Lord Garmadon's greatest regrets.
At some point after this, Garmadon gained the Shark Army and would attack Ninjago almost daily, until a Secret Ninja Force formed to repel his attacks. Eventually, his attacks were added to the daily weather forecast. On Lloyd's birthday, he attacked again in a Shark Walker, sending his Shark Army to try and take over Ninjago City. The Secret Ninja force responded and took to their mechs, fighting back against the Shark Army forces. Lloyd went after Garmadon, who kept running in his Mech all over the city, mocking the Green Ninja, telling him to shoot him if he saw him. Lloyd then saw the shark head poking out and fired, and Garmadon yelled that Lloyd hit his kidney. Lloyd then tracked Garmadon down and used his Green Ninja Mech Dragon to send rapid fire missiles at Garamdon, after the Dark Lord said that he left because his son cried all the time, had no hair or any teeth. Garmadon was then surrounded by the Ninjas' mechs, and he threw a bomb at Lloyd, which he could not catch. As Lloyd yelled at him to get out of his life, Garmadon told Lloyd he had a lot of problems and that he hoped that he would have them sorted out by the time he was back to attack again.
Garmadon then returned to his Volcanic Lair and met with his generals, telling them they had finally taken Ninjago. When General Number 1 tried to correct him, Garmadon yelled that he was being sarcastic, and asked #1 if he wanted to be a follower or a leader. When he said leader, Garmadon fired him out the volcano. Other generals dropped ideas, only to be fired as well. But then, some IT Guys gave him the blueprints for a new mech, Garma Mecha Man. They then got to work building it.
The next day, he attacked again, with a bigger army and the new Garma Mecha Man. Once again, The Ninja went to stop him, but it went differently. Garmadon grabbed the Mech Dragon and flung it into the docks, firing off tons of Sharks. He then climbed up the tower to the mayor, and planting a flag, finally taking Ninjago City after so many tries. Lloyd followed him up on his dragon, and aimed the Ultimate Weapon at the Garma Mecha Man, demanding Lord Garmadon leave Ninjago forever. Garmadon began dropping his weapons, and then started walking towards Lloyd, pressuring the Green Ninja into firing the weapon: a light that attracted Meowthra. Garmadon took the chance to grab the weapon and aim it at the other Ninjas' mechs, having the cat destroy them. He then used his Mech to kick the Green Ninja Mech Dragon off the tower, and some Shark Army members grabbed Lloyd.
Lloyd then revealed he was Garmadon's lost son before telling Garmadon that he wished that Garmadon wasn't his father before escaping. Garmadon then moved from his volcano to the tower, and the Shark Army partied there in celebration of their victory yet Garmadon was upset over Lloyd wishing he wasn't Loyd's father. He then called out to his then General Number 1 and asked her if she had captured the Ninja, Master Wu or Koko like he asked her to, which she didn't as she was busy celebrating with the other Generals, which gets her fired from the volcano.