Ninjago | S3E4 | The Curse of the Golden Master

The ninja journey under Ninjago City to meet up with the Serpentine, believing that they stole the hard drive containing the Digital Overlord. Not only do they find that they didn't steal it, but that they've also become a civilized race as well. Eventually, an army of Nindroids attacks the Serpentine, with the ninja battling them and protecting their former enemies. In the meantime, Lloyd and his father encounter an army of Nindroids and the corrupted Sensei Wu in Hiroshi's Labyrinth. While Garmadon battles his brother, Lloyd tries making his escape but is cornered by the Nindroid Mechdragon, with Wu holding up Garmadon on board. As he summons his power to combat it, he is captured by the Stranger, who reveals himself to be Pythor, having survived being eaten by the Devourer now has his skin bleached white. Lloyd is taken aboard the Mechdragon and flown off after his father is thrown off the dragon and into the sea below.