Most Information and Bio picture are from Xbox360Achievements.org and its posters xRogue 5x and Fizzmatix. Original thread can be found at this location.
Grimgreave is a Most Wanted Ghost in the online mode of Ghostbusters: The Video Game. He is a variation of the Stone Gargoyle and is fought after the player has captured Dolnasky the Foreman and killed 20 Stone Gargoyles or Stone Angels by slamming them. He appears in the Times Square levels.