Alot of hard work
I can see alot of hard work went into this. Good art work.
Your script needs work.
The story was too lose and didnt really have a direction. They were at an airport then went to a graveyard? Didnt make sence. You needed a tighter script. And what connection did the undead guy that flashed in and out have with the guys?
You could have done this with some better dialogue.
You could simply add more dialogue to explain the story better with out alot of changes (except maybe where the dialogue is longer than the pics) and it will make it a much better flash.
You almost pulled it off, but not quite. I expect the next ones will be even better. Rember, keep it simple. Get too complex and the toon gets lost in the mix.
GL