[Update 03/02/2021: Need to redo this review completely. Fix the screenshots also.]
Some military scientists are working on a drug. Some terrorists steal it, it gets loose and BAM! everybody's a zombie!!! Zombies that run, zombies that really, really like to climb up things and jump off of them, flying head zombies, legless swimming zombies, radio DJ zombies, zombies that like to hide in haystacks, zombies that like to jump out of bushes like an acrobat, zombies that like to hide under piers, zombies that if a hand grenade explodes 50 feet behind them they just fall over dead, zombies that just stand still and never move, zombie birds...every kind of zombie you can think of! It's complete chaos and I have no idea what the story was even going for, but it's goal was to make me laugh then it worked brilliantly.
If you are new to the zombie genre then wait until you've exhausted all of the classics before delving into this one, but if you're looking for a silly zombie film for you and your friends to laugh at then ZOMBI 3 is for you!