Doraemon Movie 02: Nobita no Uchuu Kaitakushi
English name: Doraemon the Movie: The Records of Nobita, Spaceblazer
Genres: Adventure, Comedy, Fantasy
Type: Movie, Episodes: 1
Aired: Mar 14, 1981
Studio: Shin-Ei Animation
Source: Unknown
Rating: PG - Children
Synopsis:
Nobita has been having a weird dream about a boy named Roppel and his strange companion Chami traveling in space. By a twist of fate, he met them in person where it turns out that they are real and that they were being pursued in space, causing their space vehicle to malfunction, connecting the space vehicle itself with Nobita's room. They journeyed to Roppel's planet and amidst their enjoyment, Nobita and Doraemon pledged to help Roppel's planet free from their oppressors. 

(Source: ANN)