Goku, Gohan, Vegeta, and Trunks decide to train within the Room of Spirit and Time, a place where a year's time passes in one day. Upon first experiencing the overwhelming null space inside, Trunks has his doubts. Elsewhere, while pursuing Goku, the Artificial Humans move from Goku's house to the Kame House. There they are met by Piccolo and company, who challenges them once again to battle...