When does Higglytown Heroes return?

Higglytown Heroes is an American CGI-animated children's television series. It was created by George Evelyn, Holly Huckins, Denis Morella, Kent Redeker, and Jeff Ulin. The show's characters are shaped like Russian nesting dolls. The theme song of the show is performed by They Might Be Giants, which was also released on their second children's album Here Come the ABCs.