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Tony Hawk's Underground (known in Japan as Tony Hawk's Pro Skater 2003) is a skateboarding game developed by Neversoft and published by Activision or the PlayStation 2, Xbox, and GameCube on October 27, 2003. The fifth installment of the long-running Tony Hawk franchise and the sequel to Tony Hawk's Pro Skater 4, Tony Hawk's Underground is the first main game in the franchise to disband the "Pro Skater" name, adding a brand new story mode (in which the player's custom skater rises from a local unknown to a superstar). The game also introduces the ability to travel on foot (allowing players to navigate certain areas easier, either in or out of a combo chain, while allowing them to climb to places unreachable by skating), ability to wallplant and wallpush (pushing the skater off the wall when approaching it straight on), and limited vehicle gameplay.
The game also introduces enhanced character creation, as players can create tricks using the Create-A-Trick mode and map custom faces to their skaters (PlayStation 2 version only). Players can also create custom objectives for both regular and custom maps using the new Create-A-Goal mode.
This game was ported to the PC (in Australia only) by Beenox sometime in 2004. A handheld version was also developed for the Game Boy Advance by Vicarious Visions, maintaining the 2D isometric gameplay from the handheld versions of the previous four installments of the franchise.
Tony Hawk's Underground, like previous installments in the series, features crossover characters from different franchises as hidden playable skaters: Gene Simmons (the bassist from the band KISS) and Iron Man (a superhero from the Marvel franchise of the same name).