This Saturday on Star Wars Rebels, Darth Maul finally faces down with Obi-Wan Kenobi. It’s the rematch he’s been waiting for since The Phantom Menace, when Kenobi cut him in two and derailed his rise to power. But it was a battle that was never supposed to happen.
Source: io9 – Darth Vader Almost Killed Darth Maul Last Season on Star Wars Rebels