Howler: Attack of the Shadow Army

 is an American animated direct-to-video supernatural-comedy film based on Howler. It is directed by TBD and has released on October 4, 2011 with its Cartoon Network premiere on May 25, 2012.

Summary
After the Nightstalker returns, he revives Shadow Howler and have both of them create an army of shadow people as revenge on Howler. When Howler notices the chaos that has been happening thanks to them, he must stop them.

Voice cast

 * Charlie Schlatter (Jeffrey) and Kevin Michael Richardson (Howler) as Jeffrey Morrison/Howler
 * Jennifer Hale as Bella Stoker
 * Jeff Bennett as George
 * Kat Cressida as Georgia
 * John DiMaggio as Frank N. Stein
 * Doug Lawrence as Greg
 * Dee Bradley Baker (vocal effects) as Lex
 * Kimberly Brooks as Wylda
 * Keith Ferguson as Zachariah
 * Nika Futterman as Zoey
 * Ashley Johnson as Kris
 * Lacey Chabert as Kloe
 * Bumper Robinson as Phillip
 * Mae Whitman as Lacey
 * Robin Atkin Downes as Shadow Howler
 * TBD as Shadow Bella
 * TBD as Shadow George
 * TBD as Shadow Georgia
 * TBD as Shadow Frank
 * TBD as Shadow Greg
 * [Baker as well, Welker, Fred Tatasciore, Tom Kenny, John DiMaggio, Charlie Adler or TBD] (vocal effects) as Shadow Lex
 * Keith David as the Nightstalker

Trivia

 * It would later premiere on Cartoon Network on May 25, 2012, 7 months after its release on DVD and Blu-Ray.
 * This is the first non-Collin the Speedy Boy direct-to-video film based on a Warner Bros. Interactive Entertainment game.