The Sea Monkeys , in the movie Frankenweenie , are freshwater dwellers .
After finding Sparky at the town 's pet cemetery , Victor sees the monsters heading to the fair and goes with his classmates to help deal with them — the Sea-Monkeys explode after eating salt-covered popcorn ( due to them being freshwater ) , and Colossus is stepped on by Shelley , while the rat and Shelley are returned to their original , deceased forms after both being electrocuted .
Frankenweenie -LRB-2012 film-RRB-