S01E105 - Legendary Young Soldier
Synopsis
The 999 goes to some weird planet full of demotivated cyborgs and Tetsuro and Maetel are taken hostage by a bunch of kids. The Kids try to convince Tetsuro not to get a robot body and to help them fight against the cyborgs. Tetsuro spends most of the episode trying to figure out what is right. All of the human kids are killed by cyborgs, and they throw Tetsuro off a building. But he survives long enough to be rescued by Maetel, but she instead allows him to fall to his death. Ultimately the whole thing turns out to be just a dream.