Sonic the Hedgehog protagonist Sonic the Hedgehog, a blue hedgehog able to run at supersonic speeds, and recurring villain Dr. Eggman, an evil scientist whose ambition is to conquer the world. Among Sonic's many allies, the most well-known include: Miles "Tails" Prower, a twin-tailed, highly intelligent yellow fox who is Sonic's sidekick and best friend; Amy Rose, a pink hedgehog who is Sonic's self-proclaimed girlfriend and a hero in her own right; Knuckles the Echidna, a coolheaded red echidna who is the guardian of the Master Emerald; Shadow the Hedgehog, an anti-heroic doppelgänger of Sonic with a dark past; and Metal Sonic, a
Sonic the Hedgehog in comparison to other Sonic media. The "Sonic the Hedgehog" franchise was awarded seven records by Guinness World Records in "Guinness World Records: Gamer's Edition 2008". The records include "Best Selling Game on Sega Systems", "Longest Running Comic Based on a Video Game" and "Best Selling Retro Game Compilation" (for "Sonic Mega Collection"). In the "Guinness World Records: Gamer's Edition 2010", the "Sonic the Hedgehog" series was listed number 15 out of the top 50 video game franchises. In September 1996, "Next Generation" ranked the Genesis installments of the series (but not the Game Gear or Sega CD entries that