He turns into Dark SONIC when he is Angry or upset :)
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There is no dark super sonic!!!!!!! -_-
when he gets really mad because the metarex captured cosmo and chris. This happens in episode 67 of sonic x. by mf842 :)
I don't know but is sadv_paltol to hack sonic and look like dark sonic
That's Dark Super Sonic. He's appear on Sonic X episode 67