Lidsville

In January 2011, a computer-animated musical film adaptation of the Lidsville TV series was announced to be in development with Conrad Vernon slated to direct while Alan Menken would be composing the songs with Glenn Slater. Menken stated that, "The songs will be an homage to '60s psychedelic concept-album rock." However, in June 2016, Lidsville creator Sid Krofft told The Wall Street Journal that, "It was going to be like Hair or Tommy, a full-blown musical. But they went in a strange direction and it just didn't work."

Why It Was Cancelled

 * 1) Sid Krofft didn’t like the idea of a Lidsville movie.