|"Hurry, Gokū! The Mysterious Mountain of the Five Elements"|
|Rōmaji||Isoge Gokū! Gogyōzan no Nazo|
|FUNimation||Mystery of the Dark World|
|Arc||Wedding Dress Arc|
|Japanese||April 12, 1989|
|English||November 26, 2003|
"Hurry, Gokū! The Mysterious Mountain of the Five Elements" (いそげ悟空！五行山のなぞ, Isoge Gokū! Gogyōzan no Nazo; FUNimation "Mystery of the Dark World") is the one hundred fifty-second episode of the Dragon Ball anime.
Baba warns Gokū that the fan won't work and he must go to the Furnace of Eight Divinations located at the base of the Mountain of Five Elements and meet Tajoro. Gokū and Chi-Chi journey and enter the Dark World. They jump over a large gap on the road and get chased by bats. As Gokū and Chi-Chi go further things become more dangerous, but they discover all the dangers are imaginary and proceed. Gyūmaō gets trapped at the peak of the castle. Gokū meets Gohan at the furnace, who tells him Tajoro is actually called An'nin. Gokū wants to put out the furnace which Gohan and An'nin object to.
|Role||Seiyū||FUNimation dub Voice Actor|
|Son Gokū||Masako Nozawa||Sean Schemmel|
|Chi-Chi||Mayumi Shō||Cynthia Cranz|
|Gyūmaō||Daisuke Gōri||Kyle Hebert|
|Uranai Baba||Junpei Takiguchi||Linda Young|
|An'nin||Keiko Yokozawa||Mae Moreno|
|Son Gohan||Osamu Saka||Christopher R. Sabat|
|Narrator||Jōji Yanami||Brice Armstrong|