The last episode of the Clone Wars was titled "The Lawless". In the episode, Satine was rescued from her cell by the Death Watch rebels and her nephew Korkie but she only managed to get a brief distress call to the Jedi Temple before she was recaptured. Then Obi-Wan came, nearly rescued her, but then they both got captured again. Darth Maul brought Obi-Wan back to his palace just so that Obi-Wan could watch as Maul killed Satine. As Obi-Wan was taken back to his cell, Bo-Katan and the Night Owls came and rescued them. They were chased throughout the city until they came out to the docks to find a huge battle going on.
Meanwhile, Darth Sidious landed on Mandalore, and after killing several guards, arrived at the palace. Darth Maul attempted to gain favor with him again, stating that all that he had done was so that he could be at his master's side again, but Sidious rejected him and there was an epic duel between Maul and Savage and Darth Sidious.
Obi-Wan and Bo-Katan were still fighting at the docks. Now, I don't know if anyone noticed this, but all of the Death Watch warriors under Maul's command now had red armor. At first I thought it was just because red was kind of Maul's color, but in the fight scene at the docks it kind of became clear that it was to distinguish Maul's warriors from the rebels. I don't know how, but there was still a whole ship full of Death Watch warriors who weren't aligned with Maul. Bo-Katan told Obi-Wan that he should go and tell the Republic what happened. When Obi-Wan asked her if she was Satine's sister (when Bo-Katan rescued Satine it became clear that they did have some past relationship) Bo-Katan only looked away, pretty much confirming that she was. I found it interesting that Satine was such a hard-core pacifist while Bo-Katan was pretty much the opposite.
Darth Sidious' duel with Maul and Savage had moved across the palace. Sidious pushed Maul away, and while Maul was recovering he killed Savage. As Savage died, the Nightsister magic that was placed on him that made him so big and powerful faded, and he said to Maul that he was not worthy of being his apprentice and that he was never like Maul. I guess that while the magic was fading he kind of remembered that he had never wanted to be a powerful warrior like himself in the first place.
Maul was now enraged, and, wielding both his lightsaber and Darksaber (which he had taken from Pre Vizla and killed Satine with) he battled Sidious. Darth Sidious easily defeated him, and Maul begged for mercy but Sidious continued to smash him everywhere with the force and electrocute him with Force Lightning. If you read my earlier post "Coming up next week" about this episode then you would have read that Maul died. The reason I said that is because it was unclear on Wookieepedia whether or not he was killed (that's a reason why you should read both the preview and summary of the episode). Sidious says something like "Don't worry, I won't kill you. I have other uses for you." I don't know what that means. I hope that we'll be seeing Maul again. Maybe the creators of Star Wars just regretted killing Maul in Episode I and want to have him back as much as possible.