You will need to be playing as Goku to begin this substory. In order to make this substory appear, which becomes available after completing the main story, you have to use the Dragon Balls to wish back Androids 19 and 20. You will find the substory in the North Mountains Area. Note that even if you bring support characters along, you will still have to fight both androids alone with Goku. You will be fighting two opponents here, both of which like to spam their Super Attacks, making getting hits in on them a slight problem sometimes. Android 19 has Spiky Headbutt, a charge maneuver, and Eye Beam, a ranged attack.

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(1 of 2) Both Androids will be spamming their Super Attacks throughout the fight

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Both Androids will be spamming their Super Attacks throughout the fight (left), You will likely be hit by one when you’re fighting the other (right)

Android 20 only seems to like spamming Photon Wave over and over. Of the two, Android 20 is probably the more annoying one, as he will sit back and spam a ranged attack all the time. He also does sparingly use Absorption Mode to try and steal any Ki attacks sent his way. It’s probably best to go after Android 20 first, since you don’t want to be shot in the back while concentrating on 19, although the latter is probably going to do the same thing with Eye Beam. Either way, this will be a long drawn-out fight because of their spamming. Defeat both to finish the substory.