The Tale of the hedgehog brothers

There once was three hedgehog siblings: Two brothers and a sister. The oldest brother was a great hero with great powers while the youngest brother had no powers and was afraid to be in his heroic brother's shadow.
One day the youngest hedgehog did something out of anger and by accident became corrupted with darkness. This gave the older hedgehog no choice but to banish him to the moon for a few years.
As the time draws nearer for his return, will he tell his friends of the coming danger, or will they fear the worst.

All Sonic characters belong to Sega.