Yuji Naka

Sonic's arch nemesis Dr. Robotnik has been banished from the Land of Darkness by an evil Metal Robotnik. The devious doctor tells Sonic that the Robot Generator has been sabotaged and will blow Planet Freedom to kingdom come. But it's not until the President's beautiful daughter Sara turns on the charm that Sonic springs into action.

One night of severe rain, Sonic and Chip come by an old mansion where they decide to take shelter. Whilst Sonic seems unfazed by the creepy surroundings, Chip is scared out of its wits. The mansion is inhabited by three scary - yet sweet - ghosts who like to play tricks on innocent visitors: A cute and girlish ghost who likes to collect photographs of her terrified guests. The remaining two boy ghosts compete for her attention by taking photographs of their scare victims. Their scariness is the key to popularity in the realm of ghosts. The boy ghosts are excited at the prospect of hunting their new and unusual guests, Sonic and Chip. Who will win the ultimate competition to her heart?

After getting stranded on Earth, Sonic and his friends team up with 12-year-old Chris Thorndyke to collect all the Chaos Emeralds and defeat the evil Dr. Eggman.

Three girls meet for the first time at the start of a new semester in a brand new school. But these aren't just any girls, and this isn't just any school! Dreamcast, Sega Saturn, and Mega Drive might be the names of SEGA gaming consoles, but at Sehagaga Academy, they're also three girls destined for greatness, or at least a nostalgia trip. Wacky hijinks ensue when the girls are tested not on their math and science skills, but on their ability to complete challenges inside (literally!) classic SEGA video games. Can they fight their way through the blocky polygons of Virtua Fighter? Can their dance moves get them high enough ratings in Space Channel 5? And that isn't all! More challenges await on the road to gaining 100 medals in order to graduate, but the Sega Hard Girls won't let something like absurdity keep them down!

Classic Sonic is back to his dimension after the events of Sonic Forces. He discovers Eggman is collecting the Chaos Emeralds and already has four of them. Sonic must gather all the Chaos Emeralds before Eggman.