when he gets really mad because the metarex captured cosmo and chris.
This happens in episode 67 of sonic x. by mf842 :)
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He turns into Dark SONIC when he is Angry or upset :)
No, you cannot turn into Super Sonic in Ultimate Flash Sonic.
you turn super sonic first,then,get the smash ball and press your speicial buton.
You don't.You can only be team super sonic(super sonic, super knuckles, and super tails).