Later before Buu's saga, he's granted 1 day to come back to participate in the World Martial Arts Tournament. Hisashiburi… Kaette Kita Son Gokū, lit."Heya!! After the invasion of Babidi and Buu etc... Goku is granted Elder Kai's life, after which he defeats Kid Buu.
Later before Buu's saga, he's granted 1 day to come back to participate in the World Martial Arts Tournament. ひさしぶり... 帰 かえ って 来 き た 孫 そん 悟 ご 空 くう, Ossu!! Of course the show is interesting even without Goku.

If you want to no more about the potara earings i will tell you. . Goku gets killed in season 7 of DBZ by Cell. The Elder Kai gives Goku his life so he can use the Potara earrings with Vegeta to beat Super Buu. During the Majin Buu saga (which proceeds the Cell saga), the Elder Kai gives Goku his life so that he may help in the efforts against Majin Buu. In which season does he comes back to life permanently and in which episode? It's Been a While… Son Goku Returns") is the fourth episode of the Trunks Saga and the one hundred twenty-first overall episode in the uncut Dragon Ball Z series. After that he comes back to Earth but he still remains dead. SPOILER ^^* About seven years after the Cell saga, Uranai Baba (Roshi's sister, the old witch with the crystal ball) gives Goku twenty-four hours back on Earth so that he can fight in the Tenkaichi Budokai being held, though he is still dead (Has halo floating above head and such). . This episode first aired in Japan on December 18, 1991. . Along with Piccolo's regeneration, he has Frieza's ability to survive in space; after Cell achieves his Super Perfect Form due to his brush with death when he self-destructs, he explains in the original English dub of the anime that this is because each individual cell in his body has a life-force of their own. In the battle against Buu, the Elder Kai gives Goku his life to enable Goku and Vegeta to use the potaras to fuse to beat Buu. He later returns before the Cell saga, where he dies again (2nd time) after being blown up with Cell. "Welcome Back Goku" (オッス!!

I have looked all over the wiki and I haven't found anything that explains how they came back to life if anyone can help me out I would greatley appreciate it did they ever show how Vegeta and Goku were revived after the Buu saga. After the invasion of Babidi and Buu etc... Goku is granted Elder Kai's life, after which he defeats Kid Buu. Episode 248/233 Goku's Time is Up, he goes back to the other world(but they still show him) On episode 266/251 The Old Kai's Weapon, Elder Kai, gives his life to Goku, to go back to earth and fight Buu. Super Perfect Cell (超完全体セル, Cho Kanzentai Seru) is a version of Cell's perfect form after he receives a Zenkai from his recovery after a botched self-destruction that takes the lives of Goku, King Kai, Bubbles and Gregory.

A lot of interesting events happen during that one day pass lol. *ERR' . To elaborate on what hypergohan said.

they could have easily brought him back to life with the namekian dragon balls Yes.
Yes, he does. goku chose to stay dead because he thought he was attracting a lot of bad guys to earth and that its his fault (thats a really dumb reason, and it didn't even work because majin buu was happening.) . He later returns before the Cell saga, where he dies again (2nd time) after being blown up with Cell.