Speedster Island

Speedster Island is a location in the Sonic Underground animated series.

History
Speedster Island is the native home of Mantu, his father, and the rest of their people. For ages, they have lived on the island in peace, with fishing seemingly being a big part of their customs.

In “Head Games ”, Sonic receives a message from his mother via a Chili Dog vendor who seemingly is an ally of Aleena’s. The note tells Sonic to head to Speedster island, to which the Sonic Underground head off to.

In the meanwhile, Sleet, Dingo , and Bartleby were negotiating with the Chief about selling the island in order for the three to build a resort. Mantu, upset over his father selling the island, ran to the Guardians, asking them for help, but to no avail. Unbeknownst the anyone, including Bartleby, Sleet was planning on roboticizing all inhabitants of the island, though he didn’t make this known until later on.

Once the Sonic Underground arrived on the island, Mantu encountered them on the beach, mistaking them for the Guardians having come to help them. Although he initially runs away from them, he soon asks the trio to help save the island from coming under the rule of Dr. Robotnik .

The Sonic and Sonia, soon after sneaking into Bartleby’s residence, were eventually spotted and pursued by Swatbots as well as Sleet and Dingo. The two ran to where the Guardians were, where they found Manic trying to dig them up, having exposed more of their bodies, and in turn, three musical notes carved into said bodies. The three then took out their instruments and played the three notes that Manic had uncovered, bringing the Guardians to life. The Guardians then destroyed the Swatbots and forced Sleet, Dingo, and Bartleby to run away.

Sonic then told Mantu to simply play these three notes if he ever needed the help of the Guardians again. Soon after, the Sonic Underground left the island and continued on their journey.