By Charles Webb

In this clip from the upcoming home video release of the documentary, "Necessary Evil: Super-Villains of DC Comics," find out how the villains of the DCU function as mirrors of their heroic counterparts. "Pacific Rim" and "Hellboy" director Guillermo Del Toro offers his own take on what makes an effective bad guy: "I think a good nemesis for a hero needs to have some of the hero in him." He adds "You are defined as much by the darker side of the mythology as you are by the light side of mythology.

From the official synopsis:

"Necessary Evil: Super-Villains of DC Comics" explores the thin line between right and wrong, the nature of evil and how super-villains can reflect society’s dark side as well as our own personal fears. It also offers keen insight as to the reasons why comic book fans are so fascinated by the very characters they hope to see defeated. Featuring interviews with such luminaries as directors Richard Donner (Superman), Guillermo del Toro (Pacific Rim) and Zack Snyder (Man of Steel), the film focuses on DC Comics’ most terrifying villains, including The Joker, Lex Luthor, Bane, Black Adam, Black Manta, Catwoman, Darkseid, Deathstroke, Doomsday, General Zod, Sinestro, the Suicide Squad, and more.

"Necessary Evil: Super-Villains of DC Comics" will be available on DVD, Blu-ray, and VOD on October 25th.