Whoops, I why did I say that? My bad my bad my bad...
I meant the final battle with Buu of course ("Boo" in the French version)...
In the Mangas, after Cell is destroyed, there's a period of peace, and Great Saiyaman is born (Gohan's secret identity)...
Then comes the 4th Martial Arts tournament, where the mysterious "M" tattoed experts appear... on to the Babidi spaceship showdown and the creation of Boo...
Later on, Boo separates into Good Boo and Evil Boo, and Evil Boo absorbs Good Boo to become even more powerful. He subsequently absorbs all of Goku's friends, until Goku and Vegeta fuse to free their friends...
Small Evil Boo is created...
One final epic battle with Gohan, helped by Goku from the afterlife, defeats Boo once and for all...
The series ends on another Martial Arts tournament, when Goku discovers the reincarnation of Boo in a small kid participating in the contest. He retires to train him and put him back on the right side...
The End.
The afterlife tournament, apparently is a DBZ exclusivity...