Description: Gohan asks Trunks if the fact that he came back from the future again means they failed, but Trunks explains it doesn't work that way and believes that going through time actually means going to another universe. Gohan believes that he's referring to the multiverse theory, and gives a brief description about how every decision can cause a different outcome, and time traveling is actually transporting oneself to a parallel universe. Trunks also reveals he came back to make sure this timeline isn't destroyed, but also because Bulma never told him about multiverse theory before the first time.