The Sonic (ソニック, Sonikku) universe refers to the Super Smash Flash series' collection of characters, stages, and properties that hail from the world famous media franchise owned by Sega and centered on its company mascot, Sonic the Hedgehog. This had been easily the most anticipated new franchise for inclusion in the Nintendo-based fighting game series and is considered the biggest "rival" franchise to Mario. Its symbol is a silhouette of Sonic's head, similar to the logo of Sonic Team.