Parodies are accorded a special status in copyright cases. Since a parody can't really succeed unless it borrows substantially from the parodied work, the normal rule that substantial borrowing amounts to infringement doesn't fit in this area. In judging whether a parody infringes on the parodied work, Courts will look at four factors: (1) purpose and character of the use, including whether the use is commercially motivated or instead is for nonprofit educational purposes; (2) nature of the copyrighted work; (3) amount and substantiality of the portion used in the newly created work in relation to the copyrighted work; and (4) effect of the use upon the potential market for or value of the copyrighted work (check out
this link for a more thorough discussion). Without knowing more about your parody or the manner in which you intend to use it,
dupre, it would be impossible for me to say whether you would be infringing on the original work's copyright or not.