In an alternate version of future trunks' world, humanity mournes the loss of its would be savior, trunks, who died facing the androids (aka cyborgs). Bulma turns from her time travel experiments to trying to find a way to defend earth. While studying Dr. Gero's blueprints and the scouer technology, she discovers how to make a power module that will amplify the ki of anyone it's implanted into to super saiyan levels. Now the earth's strongest warriors, Roshi, chi chi, and Yajirobi, must train a new group of warriors to fight for humanity.