Yes, it's another zombie movie but it's a good one. It's much better than a similarly themed WHAT LIES BENEATH.
On the day of the prom Jimmy's girlfriend Lindsey drops him to go to the dance with a more popular student. On this same night the dead begin to rise from the ground and spread the zombie contamination--and it may have something to do with leaking of the nearby nuclear reactor. Jimmy, along with some friends, make their way to the high school to warn the party-goers but when they get there the dead have already attacked and it's literally the Prom of the Living Dead.
There are some hilarious bits, such as the cemetery groundskeeper being unfazed by the zombies, and a local garage band that plays Pat Benater's SHADOWS OF THE NIGHT to keep the zombie hordes at bay.