Return of the Living Dead Rave to the Grave (2005)
A college student creates a drug called Z and sells it on campus, inadvertently resurrecting the living dead, who wreak havoc at a Halloween rave
Return of the Living Dead: Necropolis (2005)
A group of teenagers, in an attempt to rescue their friend from an evil corporation, end up inadvertently releasing a horde of bloodthirsty zombies