In the fictional universe of Sonic the Hedgehog, Knothole Village is the hidden base of operations for the Freedom Fighters, a small band (led by Sonic the Hedgehog and Princess Sally Acorn) dedicated to overthrowing the evil Dr. Robotnik. Sonic the Hedgehog is the flagship character and mascot for the video and arcade game company Sega, which has released a series of video games in which he appears. ... Sonic the Hedgehog is the flagship character and mascot for the video and arcade game company Sega, which has released a series of video games in which he appears. ... Princess Sally (or Sally Acorn) is a fictional character appearing in the Sonic the Hedgehog cartoons in 1994 and Archie comics. ... Dr. Eggman as seen on Sonic X. In Sonic the Hedgehog video games, Doctor Eggman (in modern-day and Japanese versions), or Doctor Ivo Robotnik (early United States and European versions), is the archnemesis of Sonic the Hedgehog. ...