EXCLUSIVE: Cartoon Network is entering the longform business. The 20-year-old network has greenlighted its first miniseries, Over The Garden Wall. The 10-epsiode comedy-fantasy mini is based on the short Tome Of The Unknown, which hails from Cartoon Network Studios’ shorts program and won the best animation short film at the Santa Barbara International Film Festival last month. Elijah Wood — reprising his role from Tome — Melanie Lynskey and Collin Dean lead the voice cast of Over The Garden Wall. It revolves around two brothers, Wirt (Wood) and Greg (Dean), who find themselves lost in a mysterious land and try to find their way home, aided by a wise old woodsman and a bluebird named Beatrice (Lynskey). Over The Garden Wall was created by Pat McHale, who wrote and directed the original short and also worked on Cartoon Net’s Adventure Time. Produced by Cartoon Network Studios, the mini will premiere in the fall.