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The tanks had cyborgs inside, and they started attacking. His action scientists started fighting the cyborgs, and the most effective weapon was the lightning gun... but then Helsingard showed up, and said it was time for Robo to die.
There was a second, shorter story, in which Robo fought an enemy in a mental battle. Robo's mind was in the shape of a cloudy woman, and he lost his arm... but only in his mind. The cloudy woman mind was very funny.
Good night,
Professor Dinosaur