The volcano erupts save the Marble Zone

The volcano erupts save the Marble Zone is the 7th episode of Sonic Underground 2. The previous Blaze the trail through Green Hill Zone and the fallowing episode is The springy trail of the Spring Yard Zone, and the 3rd part of the South Island Saga.

Characters

 * Sonic
 * Dr. Robotnik
 * Sonia
 * Manic
 * Sleet
 * Dingo

Locations

 * Marble Zone
 * Robotropolis

Songs

 * Sonic Underground 2 (opening theme)
 * The Green Hills

Plot
The Underground explores the going through a marble like area, with a volcano looking like it's about to blow. After the Underground gets though the team finds a Chaos Emerald! But Sleet and Dingo beat them to the Emerald, and the volcano gets ready to blow and it does but Manic tells his brother and sister that the Emerald his a counterfeit. Sonic then christens the area the "Marble Zone".

Sleet and Dingo return with the Red Chaos Emerald, but when Robotnik uses it to power a super mecha, but the Fake Emerald blows.