"The Enemy of My Enemy" is an unproduced episode of Star Wars: The Clone Wars. It was adapted into Star Wars: Darth Maul: Son of Dathomir #1, the first release of Star Wars: The Clone Wars Legacy. It was released as such on May 21, 2014.
Getting cut in half by Obi-Wan Kenobi and being rejected by his former Sith master Darth Sidious isn't going to defeat Darth Maul. In fact, it only makes him mad enough to take on the galaxy -- with an army of Mandalorians!