Return of the Living Dead: Necropolis

In an attempt to rescue their friend from an evil corporation, a group of teenagers end up releasing a horde of bloodthirsty zombies.

Return of the Living Dead: Rave to the Grave

A student creates and sells a drug called 'Z' which has the unexpected side effect of resurrecting the dead as flesh-eating zombies, who proceed to wreak havoc at a Halloween rave.