If I remember, Episode 269 "The Ultimate Power. Vejitto the Lethal Warrior!" / "Meet Vegito" It might have been the episode before that, though.
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Vegetto and superbuu was even in power then vegetto whent ssj and he was 50 times stronger than superbuu, but kidbuu is twice as strong as superbuu, if vegetto was normal, kidbuu can easily win, if vegetto when super, he could easily win kid buu, another thin goku ssj3 and vegetto is deadon even so figure out for yourself, you saw the figth of kidbuu and ssj3 goku.
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Robin appeared from the very first episode, Hi Diddle Riddle
They first appeared in episode 7 then they went to the human world and they appeard again in episode 14
Yes. She was on the first episode of season 2.