The wiki says it appears in the episode 135 of the original series, but I can't see it anywhere. What episode does it appear in? Because I need to see it.
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I'm not sure I have a reason to doubt that info. I haven't technically finished the first series, but if Akatsuki were revealed in that episode, it leaves little doubt in my mind that the Rinnegan made an appearance, even though it might not have been specified what it was at the time. – Makoto Aug 20 '16 at 23:34
It is in fact in episode 135, as can be seen here: (Taken from the end of the episode, sorry about the bad quality)
You've to remember that in the earlier episodes, we did not actually see Pain, we just saw these images of the Akatsuki members. But the rinnegan was seen already back then.