Tony Hawk's Underground is a skateboarding-adventure video game published by Activision in 2003, the fifth entry in the Tony Hawk series.

Underground is built upon the skateboarding formula of previous Tony Hawk's games: the player explores levels and completes goals while performing tricks. The game features a new focus on customization; the player, instead of selecting a professional skater, creates a custom character.

Underground adds the ability for players to dismount their boards and explore on foot. The plot follows the player character and his or her friend Eric Sparrow as the two become well-known professionals and grow apart.

In this run, The Packle breaks all sense of reality with physics-defying jumps, incredible grinding speed, and radical airs.