The Wagner Sirens are a race of aliens from Wagner 11.
Robo Machine featuring Challenge of the GoBots Mini World storybooks
The ancient Sirens could sing so powerfully that few could stand the sonic force they produced. However, their planet was dying from the inside and their numbers dwindled. By the time Cy-Kill and Doctor Braxis struck on the idea of using them against the ASC. The Sirens just wanted to die in peace but somehow the pair of villains were able to leverage them into coming to Earth to attack the ASC before being returned to Wagner 11 to do so. At first the attack seemed to go well, but Matt and A.J. added muffling to Road Ranger and Turbo so they could get close enough to reflect the sound back at Cy-Kill and Geeper-Creeper. With the Renegades out of action, the Sirens stopped their attack, and Matt and A.J. returned them to their own planet. The Wagner Sirens