Dragon Ball Z Episode 18 Here

: While training in the wilderness, Gohan's tail regrows.

: After 100 days of traveling the million-kilometer Snake Way, Goku finally reaches the end. Dragon Ball Z Episode 18

: Upon landing on the tiny, high-gravity planet, Goku famously mistakes Bubbles the monkey for the legendary King Kai. : While training in the wilderness, Gohan's tail regrows

You can find this episode and detailed guides on official and community sites like: : While training in the wilderness

: Goku discovers that King Kai's planet has gravity 10 times stronger than Earth's, making it difficult for him even to stand initially. Gohan’s Second Transformation

In , titled "The End of Snake Way" (or "Last Stop on Serpent Road"), two major training milestones occur as the heroes prepare for the arrival of the Saiyans: Goku Reaches King Kai’s Planet