druiaghtagh - I'm assuming you mean Eddie, the Iron Maiden 'Masot', as the trooper he did not appear on any album (only the best of the beast compilation). I lost touch with Maiden after Powerslave really but Eddie (in one guise or another) appears on Iron Maiden, Killers, Number of the beast, Piece of mind, Powerslave, Brave new world, Seventh son of a seventh son, Real live one (which I'm in the crowd for during Hallowed be thy name!!), Real dead one. I'm not sure about any other Maiden albums. Have a look on the Maiden website, Ironmaiden.com which is pretty good.