Doraemon went missing for 3 days. But it turns out later that he went to the 22nd century to buy a mystery galactic express train ticket whose destination is a secret until the passengers arrive there and see for themselves.
Doraemon: Nobita and the Galaxy Super-Express (ドラえもん: のび太と銀河超特急 (エクスプレス), Doraemon; Nobita to Ginga Ekusupuresu), also known as Doraemon and the Galaxy Express, is a feature-length Doraemon film which premiered in Japan on March 2, 1996, based on the 16th volume of the same name of the Doraemon Long Stories series. The film is a homage of Leiji Matsumoto's Galaxy Express 999. It's the 17th Doraemon film. The film was directed by Tsutomu Shibayama.