Criticism and satire are protected by Fair Use, however satire receives a bit more scrutiny from courts. A parody has to borrow from the original work in order to make a point about the work directly. But if you're not making a point specific to the original work, the courts believe your work should be capable of standing on its own without as extensive use of copyrighted material. Although satire is commonly protected by Fair Use, it's wise to limit your use of copyrighted works to only the minimum amount necessary to make your critical point.
Click here to learn if you are protected by Fair Use