E-10000B

"I am not a machine! I am a robot! There's difference!"

- When Wave calls him a machine in Sonic Free Riders

E-10000B is a blue robot that appears in Sonic Free Riders as a playable character in Team Dark's storyline. He appears to be on the same frequency as E-10000G. He also replaces Omega as Team Dark's power character. The "B" may stand for blue. Near the end of the game, he is revealed to be Metal Sonic in disguise. He is the only character in story mode to not be playable in multiplayer mode, being replaced by E-10000G.

Sonic Free Riders
Shadow and Rouge had just come for the EX World Grand Prix 2 and asked to join. Omochao refused because they did not have a third partner. Shadow and Rouge didn't care, saying they just want to join. Nevertheless, Omochao states that Team Dark needs three members in order to participate. Rouge then randomly picks the robot E-10000B to their team. After a little while, E-10000B complains that he is tired but is selfishly ignored. Later on, E-10000B malfunctions, breaks down, and appears to explode. This exposes him as Metal Sonic. The evil android challenges Sonic to a race, but loses and flies off angrily. It is unknown if E-10000B was a disguise for Metal Sonic or if Metal Sonic somehow got inside of him.