The Supreme Commander is actually Hearing Aid's long-lost twin brother in a smaller icebox within a giant icebox, which is his suit. His "disguise" is bigger than all the other appliances, and the Supreme Commander uses it to rule Mars, which he once moved to. He is only Supreme Commander due to electing himself as such and being inside a giant refrigerator that is his assistant.
He (secretly) despises human beings due to their abusive nature. He also states that the Wonder Luxe Appliances (his henchmen) were built just to fall apart, making them obsolete. However, a touch from Robbie (the Little Master), causes him to turn inexplicably pink and smile at the child, as it made him remember something about humans in which they are not all bad, but then reverts to his original color and pushes Robbie aside.
However, he secretly reforms after the election between him and Toaster for Supreme Commander, and reveals himself to be Hearing Aid's twin brother. After being reunited with Hearing Aid, the ex-Supreme Commander travels back to Earth with Tinselina, Toaster and his companions, but not before deactivating a rocket which was set to destroy Earth when he was in charge.