Defying Gravity (重力との戦い! バブルス君をつかまえろ, Juryoku to no Tatakai! Baburusu-kun o Tsukamaero) is the 13th episode of the Vegeta Saga in the uncut Dragon Ball Z series. The episode first aired on September 13, 1989. Its original American air date was July 11, 2005.
Goku struggles against the overwhelming gravity and mistakes King Kai's pet monkey, Bubbles, for King Kai. He then meets the real King Kai, who tells him a couple jokes much to Goku's bewilderment, the poor reaction causes King Kai to tell Goku that he won't train anyone who doesn't have a sense of humour so has one condition before he will train Goku: he must think of a joke that will make him laugh. Goku gives it his all and comes up with several weak puns that amuse King Kai immensely.
Goku tell his new mentor about the Saiyans who King Kai tracks down and tells Goku that they will arrive on Earth in 158 days and that they are even stronger than himself. King Kai begins Goku's training and gives him his first task: to catch Bubbles in the 10-G gravity of King Kai's World. Goku removes his weighted clothing and strenuously chases Bubbles but stops when he realises how hungry he is. King Kai feeds Goku then tells him to put his weighted clothing back on as it will benefit his training. He then tells Goku that the reasons why the Saiyans are so strong is because their planet has the same gravity as the planet they are on.
Back on Earth, Piccolo continues to train Gohan who notes his improvement but says he still has a long way to go. At night the two sit around a fire with Gohan telling Piccolo that he's now become like a part of his family, a "big green uncle". Piccolo annoyed at the affection tells Gohan to sleep because his training will be even harsher tomorrow.
After three weeks, Goku finally manages to catch Bubbles. Impressed that Goku has overcome King Kai's planet ten-fold gravity, King Kai anticipates that Goku may be able to master the powerful "Kaio-ken" technique.
- Goku begins his training with King Kai.
- Goku catches Bubbles.
- Gohan vs. Piccolo
Differences from the manga
- In the anime there is an additional scene showing more of Gohan and Piccolo's training before they sit around a fire at night.
- In the anime it takes three weeks for Goku to catch Bubbles. In the manga it took him 40 days.
- In the manga and the Japanese version Goku is told there are 158 days remaining until the Saiyans arrive on Earth. In the Funimation dub however they say he has 88 days remaining.