Okay, I have to be honest, this movie was lame. The special effects were horrible. The mother rat looked like some cheesy Halloween house decoration you'd leave out on your porch to wipe your feet on. The rat spawns had such fake glowing red eyes you'd think they'd be blind (but then again they all had their tails and there were way more than three of them). There was even a "Willard" type character who had a telepathic bond with the rodents (all he must have heard was "Brains! Brains! Must have fresh brains!" because the rats decapitated their victims). Although if you're actually into B- horror flicks you may love this movie and think it's the Mouse King of the genre.
Ron Perlman plays the head of the institution and the head of the forgotten experiment. It's a bad movie but he at least is, as always, good. Want to know more? Remember the remarks I made earlier about head cheese and decapitations?
Definitely a rental and definitely have a drink.