Space Tarzan (part 2)
After a few narrow escapes, Doraemon and Nobita feed mealie pellets (which make any animal tame) to a load of dinosaurs. Doraemon fixes his time machine to a hut door so when Tai and his producers walk through the door, they are 150 million years ago. The show becomes a success thanks to the "real looking dinosaurs and scenery" which cost nothing.
Aired 04/09/1979EP 134 - Space Tarzan (part 2)

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)