Kidnappers hole up with victims at cabin by remote Canadian lake. All must band together when stalked by remnant prehistoric giant killer otters.
Yeah, otters are cute. Unless you're something they want to eat. Then they're just like any other toothy instrument of death and disembowelment.
Are there giant prehistoric otters lurking in remote Canadian lakes? Probably not. If you've got a problem with that you could always make them kushtaka or a Canadian version of Jenny Greenteeth.
