Dragon Ball Kai - episode 90 - 22 Jan, 2011

Despite everyone's hopes, Goku's barrage of ki blasts fails to destroy Cell when the android activates his energy barrier at the last second. Furthermore, it is clear to the rest of the Z Fighters that Goku has spent the last of his own energy. With all eyes and ears glued to this moment of truth for Goku's mysterious plan, the battle-worn Super Saiyan surprises everyone by surrendering. Adding further shock, he announces that Gohan will be the next and last contestant to fight Cell. Piccolo and Krillin protest this decision, but Gohan agrees and takes Cell on. Gohan impresses everyone with his power - which proves indeed to be on par with Goku's - but nevertheless finds himself on the losing side of the fight against Cell. (Source: Wikipedia)