"Well, I didn't actually find out that I'd changed things, until I went back." Trunks began, offering a small smile. Just a hint sheepish. "So the time machine took a year to get refueled, then I went back to what now was the alternate timeline--but 3 years later by their reckoning. It turns out that the two androids that showed up, were late. They also weren't the androids I'd warned them about. These were two new androids, one of which was actually Dr. Gero--their creator--who'd turned himself into an android. Goku also hadn't gotten sick yet."