He also showed up at the end of Star Wars Rebels season 2 and is already set to appear in Star wars Rebels season 3.
For those who may not understand why we are even talking about Darth Maul, it was revealed in Star Wars: The Clone Wars that he actually survived the fight in The Phantom Menace and has a fancy pair of robot legs now.
Now, he did fight Obi-Wan in The Clone Wars, but Maul opted not to kill him in that confrontation.
Star Wars Rebels season 3 debuts on Disney XD on September 24.