Episode 34
Nobita's father tells him that he had received chocolate from a girl when he was a child, so Nobita and Doraemon go to the past to find out who the girl was. Nobita falls into a pond and gets wet, and Doraemon gives him a piece of cloth to wear which makes him look like a girl. They spot Nobita's father coming to the edge of the pond, and Doraemon gives Nobita chocolate which he gives to his father.
Aired 10/05/1979EP 34 - Episode 34
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)