4x41 - Dragon Ball Z: Dragon Box

Cell strikes a television studio, where he broadcasts his declaration to the entire world that he is holding the Cell Games. He says that he will take on any challengers, and if no one is able to defeat him, he will kill every last person on earth! Vegeta and Trunks resolve that, in order to win the Cell Games, they will train once again inside the Room of Spirit and Time after Goku and Gohan emerge.