okay well my idea is basically same START of the movie, hotel anniversary party, drac wanting to retire and give the hotel to mavis, etc etc. basically same stuff up until van helsing shoots johnny with the monster ray.
nothing happens immediately until drac shows up to talk to johnny (he failed to escape both ericka and mavis, and they wanted him to go talk to johnny and apologize, etc etc). drac is hit by another ray, and then both johnny n drac are affected, and swap species. johnny vampire, drac human.
big panic, chase around the hotel with johnny wanting to show mavis what happened, drac shooting the ray trying to change them back. one stray ray shot (lol) ends up basically pinballing around that ballroom/dinner hall where the drac pack & the wives (mavis and ericka purposely not in the room at the time) are, them all getting hit by the stray ray (lmao) which results in them getting species swapped.
i know it probably sounds a little weird, im still workshopping how exactly it happens but whatever.
van helsing learns that they need to repair/replace the crystal gem and turn them all back before the swaps are permanent!!
i don’t have any specific swaps thought out except i really, genuinely think if eunice was made invisible it’d be so funny.
this idea basically came from just the title of the fourth movie and what i hoped would happen from the title alone before the first trailer was released/plot was revealed. pls tell me what you think!!! i think its a fun little idea. mostly because i think the swapped monster species designs would be SO fun