Four episodes of the animated series following the adventures of speedy blue hedgehog Sonic and his best buddy Tails, a flying fox with two tails, as they try to stop the evil Dr Ivo Robotnik and his array of vicious robots from taking over the planet Mobius. Episodes are: 'Sonic Search and Smash Squad', 'Subterranean Sonic', 'Lovesick Sonic' and 'Slow Going'.