Half-Life: Decay is the the third expansion pack for the award-winning game, Half-Life. It was included as part of the PS2 version of Half-Life. Decay returns to the setting and timeline of the original story, albeit portraying the story from the viewpoint of a different set of protagonists: two scientists working in the Black Mesa Research Facility. Decay is a cooperative multiplayer game, designed to be played by two people working together to pass through the game's levels.
A bit of clever editing with some Michael Shapiro lines to re-create the final words spoken in the canon ending of Half-Life, spoken by the gman: "Wisely done, Mister Freeman. I will see you up ahead."