Rise of the Snakes Ninjago: Masters of Spinjitzu : Season 1 Episode 1

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...