Post updated on: 02/17/19 The Thirteenth Year (Disney Channel Original Movie) A young boy begins transforming into a merboy! Premiere Date: 15-May-99 TV Channel: Disney Channel IMDB: IMDB Tags: Disney Channel Original Movie Disney Category: Disney Movies, Disney TV Shows Purchase This Movie Related News: Top 10 Disney Channel Original Movies From The ’90s, According To Rotten Tomatoes, September 18, 2020 Related Disney Products: