- This article is about the fourth original Dragon Ball Z anime volume. For the in-universe location, see Pendulum Room.
Dragon Ball Z: Pendulum Room is the fourth volume of the original Pioneer Dragon Ball Z DVD and VHS releases. It includes three installments from the Saiyan conflict: episodes 11, 12, and 13. It was also included on The Saiyan Conflict box set, which collected volumes 1-8.
- Showdown in the Past - Earth's warriors Krillin, Tien, Chiaotzu, and Yamcha are training at Kami's lookout but get frustrated at the speed of their training. Kami's assistant Mr. Popo instructs them to know themselves to become stronger and to learn about their enemy to defeat it. Mr. Popo sends their spirits to the virtual reality of the Pendulum Room, where the warriors experience the overwhelming power of the average Saiyan. Then they learn the terrible reality that the two Saiyans who are approaching Earth are twice as strong!
- The End Of Snake Way - Gohan is continuing his training under Piccolo. One night, Gohan suddenly transforms to a giant ape again and attacks Piccolo! Piccolo discovers that a moon image is projected from Goku's old Saiyan space pod and Piccolo must destroy the pod before Gohan destroys him! Meanwhile, Goku finally reaches King Kai's small planet at the end of Snake Way. There, Goku finds that he must train in the gravity of the planet that is ten times stronger than Earth's!
- A Fight Against Gravity...Catch Bubbles! - After Goku passes King Kai's test to make King Kai laugh, the training begins! Goku's first task is to catch King Kai's pet monkey Bubbles in a gravity ten times stronger than Earth's. King Kai tells Goku that the Planet Vegeta, the Saiyans' home world, had the same gravity as his place and that the two Saiyans that are on the way to Earth are even stronger that King Kai himself! This fact reinforces Goku's determination to train even harder to defeat them.