Transformation Biscuits
The episode starts with Nobita's mother asking Nobita to buy desserts to treat their visitor. He goes upstairs and finds a box of Transformation Biscuits. He eats a cat shaped one and then takes the box to the visitor, who eats four of the biscuits. Then his mother reminds him to buy the desserts. He then goes to buy desserts and to his shock, turns into a cat for five minutes. Later, Nobita and Doraemon then try to stop his mother from seeing the transformation happening on the visitor. The episode ends with Nobita's father fainting upon seeing that Nobita's mother had turned into a rabbit after eating a biscuit.
Aired 03/04/1979EP 2 - Transformation Biscuits
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)