La porte entre les deux dimensions

Hysterically upset at the prospect of being trapped in the Hyperbolic Time Chamber forever, with nothing to destroy and no candy to eat, Super Buu starts to scream. To everyone's surprise including his own, his screams become so powerful that they create a hole in the barrier between the dimensions of the chamber and Earth. Buu changes shape in order to fit through it, and the hole closes, leaving Piccolo and Gotenks trapped. Back on The Lookout, Buu is hungry and excited at the prospect of turning more people into food, and so he turns everyone on the lookout into chocolate. Piccolo and Gotenks have been attempting to scream loud enough to create an inter-dimensional hole like Buu did, but they have no success. Gotenks decides to play his trump card, transforming into a Super Saiyan 3. In this state, he has the power necessary to create a hole for him and Piccolo to jump through. Upon their return to the lookout, Buu tells Gotenks that he ate all of his friends, and enraged, Gotenks promises Buu that he will pay. (Source: Wikipedia)