Movies How to Train Your Dragon The Hidden World premieres on 01-01-1970, the length of each episode (each part) is00:00:00 The author was last updated at2020-02-08 18:14:44Movies Ace. T.ase premieres on January 1, 1970, with each episode lasting 00:00:00 and last updated at 11:52:13, 19-05-15