Shadow the Hedgehog is a 2005 platform game developed by Sega Studios USA and published by Sega as part of the Sonic the Hedgehog series. The game follows Shadow as he attempts to learn about his past, while suffering from amnesia, as he does an alien invasion plagues the Earth. Shadow the Hedgehog reintroduces third-person shooter elements from Sonic Adventure and Sonic Adventure 2, but greatly expands upon the concept and introduces nonlinear gameplay to the Sonic franchise. To defeat enemies and progress through the game, Shadow can use a variety of weapons from each faction and complete missions that will determine the game's plot and subsequently playable levels.

Sonic Team is a video game developer owned by the Japanese video game company Sega as part of its Sega CS Research and Development No. 2 division. Sonic Team is best known for its namesake long-running Sonic the Hedgehog series and games such as Nights into Dreams and Phantasy Star Online.