E-111 Mu is a character who appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It was the twelfth unit in the E-100 Series line, created by Dr. Ivo "Eggman" Robotnik.
E-111 Mu was created sometime between 3236 and 3237, possibly during or after Dr. Eggman's campaign on harnessing the power of Chaos. Apparently, it went to United Federation, where it would meet E-112 Nu. However, E-102 Gamma had ambushed both Mu and Nu. Mu and Nu were eventually destroyed near Mazuri by Gamma.