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 Movie". The cartoon "Sonic Underground" ran for 40 episodes in 1999. The last Sonic series from DIC Entertainment, produced by Les Studios Tex, the show has a similar premise to "Sonic the Hedgehog", albeit in this version, Sonic is joined by two siblings, Manic and Sonia. Together they use the power of music to fight against Robotnik and eventually reunite with their mother. "Sonic X", an anime television series produced by TMS Entertainment, is the longest-running animated series based on Sonic to date, spanning a total of 78 episodes. Bearing much more similarity to the video game franchise, the series