Pendulum Room Peril
Mr. Popo leads Earth's top warriors to Kami's Pendulum Room where the past, present and future exist at the same time. After an eventful trip back in time they all realize they have to train a lot harder if they are going to stand a chance against the two Saiyans who are speeding ever closer to Earth.
Aired 30/08/1989EP 17 - Pendulum Room Peril

1989
Dragon Ball Z
Goku is back with his new son, Gohan, but just when things are getting settled down, the adventures continue. Whether he is facing enemies such as Freeza, Cell, or Boo, Goku is proven to be an elite of his own and discovers his race, Saiyan. He meets many new people, gaining allies as well as enemies, as he still finds time to raise a family and be the happy-go-lucky Saiyan he is.
(Source: Anime News Network)