When does Over the Garden Wall return?

The series centers on two half-brothers who travel across a mysterious forest to find their way home. Elijah Wood and Collin Dean voice the protagonists Wirt and Greg, and Melanie Lynskey voices Beatrice, a bluebird. Christopher Lloyd, Tim Curry, Bebe Neuwirth, Chris Isaak, Shirley Jones, Jack Jones, Thomas Lennon, Jerron Paxton, John Cleese and Samuel Ramey also voice. The series won an Emmy Award for Outstanding Animated Program in 2015.