Well, I'll try even if the gifs don't work.
A strange radio frequency gave some people at a costume party a sickness.
And because of the party, it'll spread to everyone...TURNING THEM INTO ZOMBIES?!
Then the zombies fuse with the healthy persons turning into a resident evil-esque flesh blob.
(Okay I don't get the context of the pig butt gif. Moving on.)
Now to stop this crisis, a few chosen heroes turn into a huge cube, a water drop, and a steam cloud to kick some zombie butt and save the world.
...I think I got this wrong.