Tom Clancy's Splinter Cell: Pandora Tomorrow is a 2004 stealth game developed and published by Ubisoft Shanghai and Ubisoft Milan. The game is the sequel to Splinter Cell and the second game in the Splinter Cell series endorsed by writer Tom Clancy. It follows the covert activities of Sam Fisher, an agent working for a black-ops branch of the National Security Agency (NSA) called "Third Echelon". Michael Ironside returns to voice Sam Fisher, while Dennis Haysbert voices the character Irving Lambert, Fisher's boss, making this the only time he is not voiced by Don Jordan. Lalo Schifrin provides the theme music for the game. Splinter Cell: Pandora Tomorrow received mostly positive reviews on release, with critics calling it a strong follow-up and praising its multiplayer component, which would become a staple of the series. A side-scrolling adaptation for Game Boy Advance and mobile phones was released to mixed reception. A remastered high definition version was released on PlayStation 3 in September 2011. A sequel, titled Chaos Theory, was released in 2005.