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
Adventures of Sonic the Hedgehog released on December 9, 2008, and features episodes 23–44 with the featurette "How to Draw Dr. Robotnik". The third volume contains the final 21 episodes of the series, plus the "Sonic Christmas Blast" special and the featurette "How to Draw Tails". These episodes were not compiled in the correct airdate order in the final volume. These sets were discontinued in 2012 along with "Sonic the Hedgehog" and "Sonic Underground" after Shout!'s deal with Cookie Jar Entertainment expired. In Region 2, Delta Home Entertainment released "Adventures of Sonic the Hedgehog: The Complete Series" on DVD in the UK on June 11,