Yeah, and also Sandstorm. And Superion appears at the beginning too, but...from what I saw on TFWiki, I don't think he appears again? At least not combined.
(I've read more TFWiki articles on the G1 cartoon's episodes than I've watched them)
By the time I REALLY got into Transformers (which was when Combiner Wars had just started) Hub was a distant memory, I believe. Been meaning to get the cartoon on DVD, though.