A prominent feature of the story was the look of its murderous incarnation of Sonic, who had been given black, bleeding eyeballs with glowing red pupils. It centered around the video game franchise and character Sonic the Hedgehog.
The CD had SONIC.EXE written on it (.exe is file extension designating an executable file). In August 2011, user JC-the-Hyena submitted a story on the Creepypasta Wiki about a strange CD-ROM the narrator received from a friend. Sonic.exe is part of a genre of online horror stories known as creepypasta.