Council of Four

The Council of Four is prophesied by the Oracle of Delphius who predicts that Queen Aleena and her children Sonic, Manic and Sonia will unite to finally overthrow Doctor Robotnik control over Mobius.

However the only way for the prophacy to be fufilled is that Queen Aleena must abandon her infant children, which she does with trusted families and aristrocrats (except for Manic was's baby basket was stolen).

As it was time for the prophacy to happen, the Oracle tells Sonic of his destiny and afterwards warns Doctor Robotnik of his demise.

The Council of Four has never come to pass as Sonic Underground ended at episode 40 "Virtual Danger" and the series was discontinued.