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E-123 Omega is a character from the Sonic the Hedgehog franchise created by Dr. Eggman to contain Shadow the Hedgehog. He first physically appears in Sonic Heroes where he, Shadow, and Rouge the Bat team up to form Team Dark.
His voice is provided by Maddie Blaustein in Mario & Sonic at the Olympic Winter Games and Vic Mignogna in Mario & Sonic at the London 2012 Olympic Games and Mario & Sonic at the Sochi 2014 Olympic Winter Games.
Super Smash Bros. series
Super Smash Bros. Brawl
Super Smash Bros. for Nintendo 3DS
Super Smash Bros. Ultimate
Mario & Sonic series
Mario & Sonic at the Olympic Winter Games
E-123 Omega appears in Mario & Sonic at the Olympic Winter Games as the second rival of the festival mode. He races the player in Speed Skating and has rocket boosters that speed him up drastically. In team festival mode he is not the boss of speed skating and is instead the boss of the Short Track Relay.
During the Adventure Tour in the DS version, Omega appears in Blizland where he challenges Mario and Sonic the Hedgehog to beat him in Intense Short Track. After he is beaten, Omega will reveal to Mario or Sonic that the reason why he came to Blizland was to try to defeat Dr. Eggman, but Dr. Eggman would only accept his challenge if he defeated Mario and Sonic. When he leaves, Toad says he thought Omega would join them.
Mario & Sonic at the London 2012 Olympic Games
Omega appears as one of the rivals in London Party Mode in the Wii version of Mario & Sonic at the London 2012 Olympic Games. When the player encounters him, he challenges them to the 100m Sprint so as to prove his speed. If encountered again after being beaten, he challenges the player to a rematch, this time in the 4x100m Relay. In the latter event, Omega runs the entire event on his own, instead of with a team like the player.
Omega appears in the 3DS version as a rival in the Wrestling-Freestyle event.
Mario & Sonic at the Sochi 2014 Olympic Winter Games
E-123 Omega appears in Mario & Sonic at the Sochi 2014 Olympic Winter Games as one of the rivals in the Legends Showdown mode. He is found in Area 5, and is raced against in Roller Coaster Bobsleigh.
Mario & Sonic at the Rio 2016 Olympic Games
Omega returns in the Nintendo 3DS version of Mario & Sonic at the Rio 2016 Olympic Games, this time as a playable character (although, like Dry Bowser, he is only playable in the Javelin Throw and Javelin Throw Plus events). This marks his first playable appearance in the series.
Super Smash Bros. Brawl Sticker information
Super Smash Bros. for Nintendo 3DS Trophy