Episode 31
Nobita is jealous of Suneo's collection of antiques so has Doraemon use a time cell phone to swap modern things with old things held in a 22nd Century antiques shop. Nobita misuses it and the family find everything of theirs including the house coming from ever earlier time periods. Doraemon tries to put things right but Nobita's family end up with a 22nd Century house whose automation is full of trouble. Nobita appears completely naked as his clothes vanish. This episode is remade in 1986 as "The Time Receiver."
Aired 07/05/1979EP 31 - Episode 31
Doraemon
Nobi Nobita is a 4th-grade boy in Tokyo. One day, a round, blue cat-style robot (minus ears) pops up in his desk drawer. Nobita's great-great-grandson (or something) lives in the 22nd Century, but thanks to Nobita's mistakes, the entire family is living in poverty. To rectify this, Nobita's descendent is sent Doraemon back to the past, to help prevent Nobita from making mistakes. Of course this is a difficult task since Nobita is the weakest and least intelligent child in his class. Doraemon does, however, have a 4-dimensional pocket on his front, which contains cool gadgets from the future. With these toys, Doraemon will try to help Nobita. Unfortunately, Nobita also has the bad habit of misusing Doraemon's gadgets and landing himself in yet more trouble?
(Source: AnimeNfo)