Rip Torn is in the movie, dressed as a Large-Headed Alien at the funeral of Zed, his own character from earlier installments. We aren't told why Rip Torn didn't have a bigger role in the movie, but his arrest in 2010 probably had something to do with it. From Wikipedia: "On January 29, 2010, Torn was arrested after breaking into a closed Litchfield Bancorp branch office in Lakeville, Connecticut, where Torn maintains a residence. He was charged with carrying a firearm without a permit, carrying a firearm while intoxicated, first-degree burglary, second-degree criminal trespassing and third-degree criminal mischief. The Connecticut State Police said that Torn broke into the bank thinking it was his home.... On December 14, 2010, Torn pled guilty to a litany of charges: reckless endangerment, criminal trespass, criminal mischief and the illegal carrying of a firearm and was given a two-and-a-half-year suspended jail sentence and three years probation."