第 1 季 共 13 集
播出时间：2012年1月12日
第 1 集 Rise of the Snakes
播出时间：2012年1月12日
The Ninja are snapped out of their post-victory complacency when Lord Garmadon's young and rather childish son Lloyd shows up and tries to pick up where his father left off. To this end, he releases the Hypnobrai, one tribe of an ancient race of snake people called the Serpentine, who immediately go on the attack. The Ninja beat them back and steal their staff, which holds an anti-venom to the Serpentine's power of hypnosis. Added to this, the Ninja discover a prophecy that one Ninja would rise above the others and become the Green Ninja, the fighter who would defeat the Dark Lord Garmadon...
第 2 集 Home
播出时间：2012年1月19日
Back in training mode with the looming threat of Lloyd and the Hypnobrai, Zane wanders after a Falcon and lands himself in a heap of trouble.
第 3 集 Snakebit
播出时间：2012年1月26日
Lloyd unlocks a second tribe - The Fangpyre - to help him regain control and have his revenge on the Hypnobrai. The Ninja are busy cleaning and setting up their new HQ aboard the Destiny's Bounty with modern features, but are called into duty when the Fangpyre attack the junkyard where Jay's parents, Ed and Enda, live. The Ninja, especially Jay, must rush to save the pair from the transforming venom of the Fangpyre...
第 4 集 Never Trust a Snake
播出时间：2012年2月2日
After the Fangpyres join forces with the Hypnobrai, Lloyd releases Pythor - the last remaining snake of the Anacondrai tribe. Pythor, pretending to be his friend, steals a map from him that shows where the two remaining snakes tribes dwell. Sensei Wu then takes Lloyd under his wing. Note: First appearance of Pythor.
第 5 集 Can of Worms
播出时间：2012年2月9日
Lloyd moves in and tries to make nice by helping out with chores, but he just gets in the way. Pythor has awoken the Vipoids and the Constrictaurs and an all out snake war has taken over Ninjago.
第 6 集 The Snake King
播出时间：2012年2月16日
Pythor declares himself to be the destined leader who will reawaken The Great Devourer - an ancient beast who can't be killed and will consume all of Ninjago.
第 7 集 Tick Tock
播出时间：2012年2月23日
When the four ninja follow the mysterious falcon into the woods, they stumble on a hidden work shop where Zane learns the secret about his past and in the process, he is the first ninja to unlock his true potential.
第 8 集 Once Bitten, Twice Shy
播出时间：2012年3月8日
Jay and Nya have to cut their first date in Mega-Monster Amusement Park short as the Serpentine are on their way to retrieve the first of four fang blades to be used to awaken the Great Devourer.
第 9 集 The Royal Blacksmiths
播出时间：2012年3月15日
The four Ninja go undercover as a dance troupe and enter a talent contest in their quest to win “The Blade Cup”, in which one of the fang blades is hidden, taken from its tomb by Clutch Powers. During this, Cole meets his father, the leader of one particularly famous dance troop, who, if anything, is bossier than Sensei Wu. At once point, Cole contemplates stealing the cup, but is berated by his father and decides to make him proud by performing and winning the cup. Cole, saving his father when Pythor collapses the stage while stealing the cup, finds his true potential.
第 10 集 The Green Ninja
播出时间：2012年3月22日
The Ninja are suspicious when Lord Garmadon, brought by Sensei Wu from the realm of darkness he fled to, moves in to help searching for his missing son - but realize they have to work together in their attempt to rescue Lloyd from the Serpentine while they dig for the third Fang Blade in the heart of the Fire Temple. Kai, after being held back by his ambition to become the Green Ninja, reaches his true potential and rescues Lloyd. It is also revealed, though Kai's own realization, that Lloyd is the destined Green Ninja. This causes grief to both Wu and Garmadon, since their family has now been further divided.
第 11 集 All of Nothing
播出时间：2012年3月29日
When the ninja are captured trying to find the Serpentine's inner sanctum,and Lloyd's rescue mission fails; It's up to Garmadon to save them.
第 12 集 The Rise of the Great Devourer
播出时间：2012年4月5日
Upon arriving at Torchfire Mountain, where the Fangblades can be destroyed, Pythor reveals himself and steals the blades back, leaving the Ninja to die. The four, with Wu, Nya (Samurai X) and Lloyd, haste to the lost city of Ouroboros to try to stop Pythor from awaking The Great Devourer, but it is a race against time. After a battle on a Serpentine Truck-fortress, in which Sensei Wu deliberately cuts himself off from the Ninja, all arrive at the city. At last, Pythor succeeds, but Sensei Wu follows him and forces him to see the power he has unleashed. They are then both consumed by the awakened Great Devourer.
第 13 集 Day of the Great Devourer
播出时间：2012年4月12日
Season Finale:Disaster threatens as the Ninja must fight to defeat the all consuming Great Devourer in a desperate attempt to save Ninjago. In the end, only Lord Garmadon, using the Four Golden Weapons, can destroy the Devourer. The snake is destroyed and Wu is shown to have survived, but Lord Garmadon vanishes with the Weapons and Lloyd must accept the fact that he must face him one day...
